Data Series
| Period | Discount | Yield |
| Oct-2020 | 4.31 | 4.5 |
| Sep-2020 | 4.31 | 4.5 |
| Aug-2020 | 4.31 | 4.5 |
| Jul-2020 | 4.31 | 4.5 |
| Jun-2020 | 4.31 | 4.5 |
| May-2020 | 4.31 | 4.5 |
| Apr-2020 | 4.31 | 4.5 |
| Mar-2020 | 6.1 | 6.5 |
| Feb-2020 | 6.1 | 6.5 |
| Jan-2020 | 6.1 | 6.5 |
| Dec-2019 | 6.1 | 6.5 |
| Nov-2019 | 6.1 | 6.5 |
| Oct-2019 | 6.1 | 6.5 |
| Sep-2019 | 6.1 | 6.5 |
| Aug-2019 | 6.1 | 6.5 |
| Jul-2019 | 6.1 | 6.5 |
| Jun-2019 | 6.1 | 6.5 |
| May-2019 | 6.1 | 6.5 |
| Apr-2019 | 6.1 | 6.5 |
| Mar-2019 | 6.1 | 6.5 |
| Feb-2019 | 6.1 | 6.5 |
| Jan-2019 | 6.1 | 6.5 |
| Dec-2018 | 5.08 | 5.35 |
| Nov-2018 | 5.08 | 5.35 |
| Oct-2018 | 5.08 | 5.35 |
| Sep-2018 | 5.08 | 5.35 |
| Aug-2018 | 5.08 | 5.35 |
| Jul-2018 | 5.08 | 5.35 |
| Jun-2018 | 5.08 | 5.35 |
| May-2018 | 5.08 | 5.35 |
| Apr-2018 | 5.08 | 5.35 |
| Mar-2018 | 5.08 | 5.35 |
| Feb-2018 | 5.08 | 5.35 |
| Jan-2018 | 5.08 | 5.35 |
| Dec-2017 | 5.08 | 5.35 |
| Nov-2017 | 5.08 | 5.35 |
| Oct-2017 | 5.08 | 5.35 |
| Sep-2017 | 5.08 | 5.35 |
| Aug-2017 | 5.08 | 5.35 |
| Jul-2017 | 5.08 | 5.35 |
| Jun-2017 | 5.08 | 5.35 |
| May-2017 | 5.08 | 5.35 |
| Apr-2017 | 5.08 | 5.35 |
| Mar-2017 | 5.08 | 5.35 |
| Feb-2017 | 5.08 | 5.35 |
| Jan-2017 | 5.08 | 5.35 |
| Dec-2016 | 5.08 | 5.35 |
| Nov-2016 | 5.08 | 5.35 |
| Oct-2016 | 5.08 | 5.35 |
| Sep-2016 | 5.08 | 5.35 |
| Aug-2016 | 5.08 | 5.35 |
| Jul-2016 | 5.08 | 5.35 |
| Jun-2016 | 5.08 | 5.35 |
| May-2016 | 5.08 | 5.35 |
| Apr-2016 | 5.08 | 5.35 |
| Mar-2016 | 5.08 | 5.35 |
| Feb-2016 | 5.08 | 5.35 |
| Jan-2016 | 5.08 | 5.35 |
| Dec-2015 | 5.08 | 5.35 |
| Nov-2015 | 5.08 | 5.35 |
| Oct-2015 | 5.08 | 5.35 |
| Sep-2015 | 5.08 | 5.35 |
| Aug-2015 | 5.08 | 5.35 |
| Jul-2015 | 5.08 | 5.35 |
| Jun-2015 | 5.08 | 5.35 |
| May-2015 | 5.08 | 5.35 |
| Apr-2015 | 5.08 | 5.35 |
| Mar-2015 | 5.08 | 5.35 |
| Feb-2015 | 5.08 | 5.35 |
| Jan-2015 | 5.08 | 5.35 |
| Dec-2014 | 5.08 | 5.35 |
| Nov-2014 | 5.08 | 5.35 |
| Oct-2014 | 5.08 | 5.35 |
| Sep-2014 | 5.08 | 5.35 |
| Aug-2014 | 5.08 | 5.35 |
| Jul-2014 | 5.08 | 5.35 |
| Jun-2014 | 5.08 | 5.35 |
| May-2014 | 5.08 | 5.35 |
| Apr-2014 | 5.08 | 5.35 |
| Mar-2014 | 5.08 | 5.35 |
| Feb-2014 | 5.08 | 5.35 |
| Jan-2014 | 5.08 | 5.35 |
| Dec-2013 | 5.08 | 5.35 |
| Nov-2013 | 5.08 | 5.35 |
| Oct-2013 | 5.08 | 5.35 |
| Sep-2013 | 5.08 | 5.35 |
| Aug-2013 | 5.08 | 5.35 |
| Jul-2013 | 5.08 | 5.35 |
| Jun-2013 | 5.08 | 5.35 |
| May-2013 | 5.08 | 5.35 |
| Apr-2013 | 5.08 | 5.35 |
| Mar-2013 | 5.08 | 5.35 |
| Feb-2013 | 5.08 | 5.35 |
| Jan-2013 | 5.08 | 5.35 |
| Dec-2012 | 5.08 | 5.35 |
| Nov-2012 | 5.08 | 5.35 |
| Oct-2012 | 5.08 | 5.35 |
| Sep-2012 | 5.08 | 5.35 |
| Aug-2012 | 5.08 | 5.35 |
| Jul-2012 | 5.08 | 5.35 |
| Jun-2012 | 5.08 | 5.35 |
| May-2012 | 5.08 | 5.35 |
| Apr-2012 | 5.08 | 5.35 |
| Mar-2012 | 5.06 | 5.33 |
| Feb-2012 | 4.59 | 4.81 |
| Jan-2012 | 4.59 | 4.81 |
| Dec-2011 | 4.59 | 4.81 |
| Nov-2011 | 4.59 | 4.81 |
| Oct-2011 | 4.59 | 4.81 |
| Sep-2011 | 4.59 | 4.81 |
| Aug-2011 | 4.59 | 4.81 |
| Jul-2011 | 4.59 | 4.81 |
| Jun-2011 | 4.59 | 4.81 |
| May-2011 | 4.57 | 4.79 |
| Apr-2011 | 4.57 | 4.79 |
| Mar-2011 | 4.57 | 4.79 |
| Feb-2011 | 4.57 | 4.79 |
| Jan-2011 | 4.59 | 4.81 |
| Dec-2010 | 4.59 | 4.81 |
| Nov-2010 | 4.59 | 4.81 |
| Oct-2010 | 4.59 | 4.81 |
| Sep-2010 | 4.59 | 4.81 |
| Aug-2010 | 4.59 | 4.81 |
| Jul-2010 | 4.58 | 4.8 |
| Jun-2010 | 4.65 | 4.88 |
| May-2010 | 4.93 | 5.18 |
| Apr-2010 | 5.12 | 5.4 |
| Mar-2010 | 5.29 | 5.58 |
| Feb-2010 | 5.29 | 5.58 |
| Jan-2010 | 5.28 | 5.57 |
| Dec-2009 | 5.42 | 5.73 |
| Nov-2009 | 5.65 | 5.99 |
| Oct-2009 | 5.81 | 6.17 |
| Sep-2009 | 5.96 | 6.34 |
| Aug-2009 | 6.06 | 6.45 |
| Jul-2009 | 6.23 | 6.64 |
| Jun-2009 | 6.45 | 6.89 |
| May-2009 | 6.61 | 7.08 |
| Apr-2009 | 6.7 | 7.18 |
| Mar-2009 | 6.78 | 7.27 |
| Feb-2009 | 6.9 | 7.41 |
| Jan-2009 | 7 | 7.53 |
| Dec-2008 | 7.05 | 7.58 |
| Nov-2008 | 7.12 | 7.66 |
| Oct-2008 | 7.18 | 7.73 |
| Sep-2008 | 7.18 | 7.73 |
| Aug-2008 | 7.18 | 7.73 |
| Jul-2008 | 7.18 | 7.73 |
| Jun-2008 | 7.19 | 7.75 |
| May-2008 | 7.19 | 7.75 |
| Apr-2008 | 7.19 | 7.75 |
| Mar-2008 | 7.19 | 7.75 |
| Feb-2008 | 7.19 | 7.75 |
| Jan-2008 | 7.19 | 7.75 |
| Dec-2007 | 7.19 | 7.75 |
| Nov-2007 | 7.19 | 7.75 |
| Oct-2007 | 7.19 | 7.75 |
| Sep-2007 | 7.19 | 7.75 |
| Aug-2007 | 7.19 | 7.75 |
| Jul-2007 | 7.19 | 7.75 |
| Jun-2007 | 7.19 | 7.75 |
| May-2007 | 7.19 | 7.75 |
| Apr-2007 | 7.19 | 7.75 |
| Mar-2007 | 7.19 | 7.75 |
| Feb-2007 | 7.19 | 7.75 |
| Jan-2007 | 7.19 | 7.75 |
| Dec-2006 | 7.19 | 7.75 |
| Nov-2006 | 7.19 | 7.75 |
| Oct-2006 | 7.19 | 7.75 |
| Sep-2006 | 7.19 | 7.75 |
| Aug-2006 | 7.19 | 7.75 |
| Jul-2006 | 7.19 | 7.75 |
| Jun-2006 | 7.19 | 7.75 |
| May-2006 | 7.19 | 7.75 |
| Apr-2006 | 7.19 | 7.75 |
| Mar-2006 | 7.19 | 7.75 |
| Feb-2006 | 7.19 | 7.75 |
| Jan-2006 | 7.19 | 7.75 |
| Dec-2005 | 7.19 | 7.75 |
| Nov-2005 | 7.19 | 7.75 |
| Oct-2005 | 7.19 | 7.75 |
| Sep-2005 | 7.19 | 7.75 |
| Aug-2005 | 7.19 | 7.75 |
| Jul-2005 | 7.19 | 7.75 |
| Jun-2005 | 7.19 | 7.75 |
| May-2005 | 7.19 | 7.75 |
| Apr-2005 | 7.19 | 7.75 |
| Mar-2005 | 7.19 | 7.75 |
| Feb-2005 | 6.27 | 6.69 |
| Jan-2005 | 6.27 | 6.69 |
| Dec-2004 | 6.27 | 6.69 |
| Nov-2004 | 6.27 | 6.69 |
| Oct-2004 | 6.27 | 6.69 |
| Sep-2004 | 6.26 | 6.68 |
| Aug-2004 | 6.26 | 6.68 |
| Jul-2004 | 6.26 | 6.68 |
| Jun-2004 | 6.27 | 6.69 |
| May-2004 | 6.28 | 6.7 |
| Apr-2004 | 6.29 | 6.71 |
| Mar-2004 | 6.33 | 6.76 |
| Feb-2004 | 6.37 | 6.8 |
| Jan-2004 | 6.41 | 6.85 |
| Dec-2003 | 6.43 | 6.87 |
| Nov-2003 | 6.45 | 6.89 |
| Oct-2003 | 8.37 | 9.13 |
| Sep-2003 | 8.37 | 9.13 |
| Aug-2003 | 8.37 | 9.13 |
| Jul-2003 | 8.37 | 9.13 |
| Jun-2003 | 8.37 | 9.13 |
| May-2003 | 8.37 | 9.13 |
| Apr-2003 | 8.37 | 9.13 |
| Mar-2003 | 8.37 | 9.13 |
| Feb-2003 | 8.37 | 9.13 |
| Jan-2003 | 8.37 | 9.13 |
| Dec-2002 | 8.37 | 9.13 |
| Nov-2002 | 11.73 | 13.28 |
| Oct-2002 | 11.84 | 13.43 |
| Sep-2002 | 11.84 | 13.43 |
| Aug-2002 | 11.84 | 13.43 |
| Jul-2002 | 11.84 | 13.43 |
| Jun-2002 | 11.84 | 13.43 |
| May-2002 | 11.84 | 13.43 |
| Apr-2002 | 11.84 | 13.43 |
| Mar-2002 | 11.84 | 13.43 |
| Feb-2002 | 11.84 | 13.43 |
| Jan-2002 | 11.84 | 13.43 |
| Dec-2001 | 11.84 | 13.43 |
| Nov-2001 | 11.84 | 13.43 |
| Oct-2001 | 11.84 | 13.43 |
| Sep-2001 | 11.84 | 13.43 |
| Aug-2001 | 11.84 | 13.43 |
| Jul-2001 | 11.84 | 13.43 |
| Jun-2001 | 11.84 | 13.43 |
| May-2001 | 11.84 | 13.43 |
| Apr-2001 | 11.84 | 13.43 |
| Mar-2001 | 11.84 | 13.43 |
| Feb-2001 | 11.84 | 13.43 |
| Jan-2001 | 11.84 | 13.43 |
| Dec-2000 | 11.84 | 13.43 |
| Nov-2000 | 11.84 | 13.43 |
| Oct-2000 | 11.84 | 13.43 |
| Sep-2000 | 11.84 | 13.43 |
| Aug-2000 | 11.84 | 13.43 |
| Jul-2000 | 11.84 | 13.43 |
| Jun-2000 | 11.84 | 13.43 |
| May-2000 | 11.84 | 13.43 |
| Apr-2000 | 11.84 | 13.43 |
| Mar-2000 | 11.84 | 13.43 |
| Feb-2000 | 11.84 | 13.43 |
| Jan-2000 | 11.84 | 13.43 |
| Dec-1999 | 11.84 | 13.43 |
| Nov-1999 | 11.84 | 13.43 |
| Oct-1999 | 11.84 | 13.43 |
| Sep-1999 | 12.02 | 13.66 |
| Aug-1999 | 12.87 | 14.77 |
| Jul-1999 | 12.93 | 14.84 |
| Jun-1999 | 12.93 | 14.84 |
| May-1999 | 12.93 | 14.84 |
| Apr-1999 | 12.93 | 14.84 |
| Mar-1999 | 12.93 | 14.84 |
| Feb-1999 | 12.93 | 14.84 |
| Jan-1999 | 12.93 | 14.84 |
| Dec-1998 | 12.93 | 14.84 |
| Nov-1998 | 13.2 | 15.2 |
| Oct-1998 | 13.2 | 15.2 |
| Sep-1998 | 13.2 | 15.2 |
| Aug-1998 | 13.2 | 15.2 |
| Jul-1998 | 13.2 | 15.2 |
| Jun-1998 | 13.2 | 15.2 |
| May-1998 | 13.2 | 15.2 |
| Apr-1998 | 13.2 | 15.2 |
| Mar-1998 | 13.2 | 15.2 |
| Feb-1998 | 13.2 | 15.2 |
| Jan-1998 | 13.2 | 15.2 |
| Dec-1997 | 13.2 | 15.2 |
| Nov-1997 | 13.2 | 15.2 |
| Oct-1997 | 13.2 | 15.2 |
| Sep-1997 | 13.2 | 15.2 |
| Aug-1997 | 13.2 | 15.2 |
| Jul-1997 | 13.2 | 15.2 |
| Jun-1997 | 13.2 | 15.2 |
| May-1997 | 13.2 | 15.2 |
| Apr-1997 | 13.2 | 15.2 |
| Mar-1997 | 13.2 | 15.2 |
| Feb-1997 | 13.25 | 15.27 |
| Jan-1997 | 13.68 | 15.84 |
| Dec-1996 | 14.55 | 17.02 |
| Nov-1996 | 14.95 | 17.57 |
| Oct-1996 | 15.1 | 17.78 |
| Sep-1996 | 15.12 | 17.8 |
| Aug-1996 | 15.15 | 17.85 |
| Jul-1996 | 15.21 | 17.93 |
| Jun-1996 | 15.23 | 17.96 |
| May-1996 | 15.29 | 18.04 |
| Apr-1996 | 15.37 | 18.15 |
| Mar-1996 | 15.37 | 18.15 |
| Feb-1996 | 15.37 | 18.15 |
| Jan-1996 | 15.39 | 18.18 |
| Dec-1995 | 15.45 | 18.26 |
| Nov-1995 | 16.46 | 19.69 |
| Oct-1995 | 26.95 | 36.86 |
| Sep-1995 | 27.48 | 37.85 |
| Aug-1995 | 25 | 33.3 |
| Jul-1995 | 21.5 | 27.37 |
| Jun-1995 | 20.93 | 26.45 |
| May-1995 | 17.25 | 20.83 |
| Apr-1995 | 16.44 | 19.66 |
| Mar-1995 | 16.44 | 19.66 |
| Feb-1995 | 16.1 | 19.18 |
| Jan-1995 | 13.86 | 16.08 |
| Dec-1994 | 12.84 | 14.73 |
| Nov-1994 | 13 | 14.94 |
| Oct-1994 | 14.86 | 17.45 |
| Sep-1994 | 16 | 19.04 |
| Aug-1994 | 16.07 | 19.14 |
| Jul-1994 | 16.13 | 19.22 |
| Jun-1994 | 16.19 | 19.31 |
| May-1994 | 16.44 | 19.66 |
| Apr-1994 | 16.48 | 19.72 |
| Mar-1994 | 16.62 | 19.92 |
| Feb-1994 | 16.8 | 20.18 |
| Jan-1994 | 17.23 | 20.8 |
| Dec-1993 | 17.41 | 21.07 |
| Nov-1993 | 17.4 | 21.05 |
| Oct-1993 | 17.38 | 21.02 |
| Sep-1993 | 17.36 | 21 |
| Aug-1993 | 17.36 | 20.99 |
| Jul-1993 | 17.36 | 20.99 |
| Jun-1993 | 18.04 | 22 |
| May-1993 | 18.04 | 22 |
| Apr-1993 | 18.04 | 22 |
| Mar-1993 | 18.05 | 22.01 |
| Feb-1993 | 18.05 | 22.01 |
| Jan-1993 | 17.36 | 20.99 |
| Dec-1992 | 17.36 | 20.99 |
| Nov-1992 | 17.36 | 20.99 |
| Oct-1992 | 20 | 24.98 |
| Sep-1992 | 25.5 | 34.2 |
| Aug-1992 | 25.5 | 34.2 |
| Jul-1992 | 22.5 | 29.01 |
| Jun-1992 | 22.5 | 29.01 |
| May-1992 | 22.5 | 29.01 |
| Apr-1992 | 22.5 | 29.01 |
| Mar-1992 | 22.5 | 29.01 |
| Feb-1992 | 19 | 23.44 |
| Jan-1992 | 16.3 | 19.47 |
| Dec-1991 | 16.3 | 19.47 |
| Nov-1991 | 16.3 | 19.47 |
| Oct-1991 | 17 | 20.47 |
| Sep-1991 | 18 | 21.94 |
| Aug-1991 | 18 | 21.94 |
| Jul-1991 | 18.5 | 22.69 |
| Jun-1991 | 19.5 | 24.22 |
| May-1991 | 20 | 25 |
| Apr-1991 | 20.5 | 25 |
| Mar-1991 | 22 | 28.18 |
| Feb-1991 | 20 | 24.98 |
| Jan-1991 | 20 | 24.98 |
| Dec-1990 | 20 | 24.98 |
| Nov-1990 | 20 | 24.98 |
| Oct-1990 | 20 | 24.98 |
| Sep-1990 | 20 | 24.98 |
| Aug-1990 | 20 | 24.98 |
| Jul-1990 | 20 | 24.98 |
| Jun-1990 | 20 | 24.98 |
| May-1990 | 20 | 24.98 |
| Apr-1990 | 20 | 24.98 |
| Mar-1990 | 20 | 24.98 |
| Feb-1990 | 20 | 24.98 |
| Jan-1990 | 20 | 24.98 |
| Dec-1989 | 20 | 24.98 |
| Nov-1989 | 20 | 24.98 |
| Oct-1989 | 20 | 24.98 |
| Sep-1989 | 20 | 24.98 |
| Aug-1989 | 20 | 24.98 |
| Jul-1989 | 20 | 24.98 |
| Jun-1989 | 20 | 24.98 |
| May-1989 | 20 | 24.98 |
| Apr-1989 | 20 | 24.98 |
| Mar-1989 | 20 | 24.98 |
| Feb-1989 | 20 | 24.98 |
| Jan-1989 | 20 | 24.98 |
| Dec-1988 | 20 | 24.98 |
| Nov-1988 | 20 | 24.98 |
| Oct-1988 | 20 | 24.98 |
| Sep-1988 | 20 | 24.98 |
| Aug-1988 | 20 | 24.98 |
| Jul-1988 | 20 | 24.98 |
| Jun-1988 | 20 | 24.98 |
| May-1988 | 20 | 24.98 |
| Apr-1988 | 20 | 24.98 |
| Mar-1988 | 20 | 24.98 |
| Feb-1988 | 20 | 24.98 |
| Jan-1988 | 20 | 24.98 |
| Dec-1987 | 20 | 24.98 |
| Nov-1987 | 20 | 24.98 |
| Oct-1987 | 20 | 24.98 |
| Sep-1987 | 20 | 24.98 |
| Aug-1987 | 20 | 24.98 |
| Jul-1987 | 20 | 24.98 |
| Jun-1987 | 20 | 24.98 |
| May-1987 | 20 | 24.98 |
| Apr-1987 | 20 | 24.98 |
| Mar-1987 | 20 | 24.98 |
| Feb-1987 | 20 | 24.98 |
| Jan-1987 | 20 | 24.98 |
| Dec-1986 | 20 | 24.98 |
| Nov-1986 | 20 | 24.98 |
| Oct-1986 | 20 | 24.98 |
| Sep-1986 | 20 | 24.98 |
| Aug-1986 | 20 | 24.98 |
| Jul-1986 | 20 | 24.98 |
| Jun-1986 | 18 | 21.94 |
| May-1986 | 18 | 21.94 |
| Apr-1986 | 18 | 21.94 |
| Mar-1986 | 18 | 21.94 |
| Feb-1986 | 18 | 21.94 |
| Jan-1986 | 16 | 19.04 |
| Dec-1985 | 16 | 19.04 |
| Nov-1985 | 16 | 19.04 |
| Oct-1985 | 16 | 19.04 |
| Sep-1985 | 15.5 | 18.33 |
| Aug-1985 | 13.5 | 15.6 |
| Jul-1985 | 13.5 | 15.6 |
| Jun-1985 | 13.5 | 15.6 |
| May-1985 | 14 | 16.27 |
| Apr-1985 | 15 | 17.64 |
| Mar-1985 | 15.5 | 18.33 |
| Feb-1985 | 15.5 | 18.33 |
| Jan-1985 | 15.5 | 18.33 |
| Dec-1984 | 15.5 | 18.33 |
| Nov-1984 | 15.5 | 18.33 |
| Oct-1984 | 15.5 | 18.33 |
| Sep-1984 | 14.5 | 16.95 |
| Aug-1984 | 13.5 | 15.6 |
| Jul-1984 | 13.5 | 15.6 |
| Jun-1984 | 14 | 16.27 |
| May-1984 | 12 | 13.63 |
| Apr-1984 | 12 | 13.63 |
| Mar-1984 | 12 | 13.63 |
| Feb-1984 | 10.75 | 12.04 |
| Jan-1984 | 10.75 | 12.04 |
| Dec-1983 | 11 | 12.36 |
| Nov-1983 | 11.5 | 12.99 |
| Oct-1983 | 11.75 | 13.31 |
| Sep-1983 | 11.5 | 12.99 |
| Aug-1983 | 11.5 | 12.99 |
| Jul-1983 | 10.5 | 11.73 |
| Jun-1983 | 10.75 | 12.04 |
| May-1983 | 10.75 | 12.04 |
| Apr-1983 | 10.75 | 12.04 |
| Mar-1983 | 10.25 | 11.42 |
| Feb-1983 | 0 | 0 |
| Jan-1983 | 10.25 | 11.42 |
| Dec-1982 | 0 | 0 |
| Nov-1982 | 0 | 0 |
| Oct-1982 | 0 | 0 |
| Sep-1982 | 0 | 0 |
| Aug-1982 | 0 | 0 |
| Jul-1982 | 0 | 0 |
| Jun-1982 | 0 | 0 |
| May-1982 | 0 | 0 |
| Apr-1982 | 0 | 0 |
| Mar-1982 | 0 | 0 |
| Feb-1982 | 0 | 0 |
| Jan-1982 | 0 | 0 |
| Dec-1981 | 0 | 0 |
| Nov-1981 | 0 | 0 |
| Oct-1981 | 0 | 0 |
| Sep-1981 | 0 | 0 |
| Aug-1981 | 0 | 0 |
| Jul-1981 | 0 | 0 |
| Jun-1981 | 0 | 0 |
| May-1981 | 0 | 0 |
| Apr-1981 | 0 | 0 |
| Mar-1981 | 0 | 0 |
| Feb-1981 | 0 | 0 |
| Jan-1981 | 0 | 0 |
| Dec-1980 | 0 | 0 |
| Nov-1980 | 0 | 0 |
| Oct-1980 | 0 | 0 |
| Sep-1980 | 0 | 0 |
| Aug-1980 | 0 | 0 |
| Jul-1980 | 0 | 0 |
| Jun-1980 | 0 | 0 |
| May-1980 | 0 | 0 |
| Apr-1980 | 0 | 0 |
| Mar-1980 | 0 | 0 |
| Feb-1980 | 0 | 0 |
| Jan-1980 | 0 | 0 |
| Dec-1979 | 0 | 0 |
| Nov-1979 | 0 | 0 |
| Oct-1979 | 0 | 0 |
| Sep-1979 | 7 | 7.53 |
| Aug-1979 | 7 | 7.53 |
| Jul-1979 | 0 | 0 |
| Jun-1979 | 4 | 4.17 |
| May-1979 | 0 | 0 |
| Apr-1979 | 4 | 4.17 |
| Mar-1979 | 0 | 0 |
| Feb-1979 | 0 | 0 |
| Jan-1979 | 0 | 0 |
| Dec-1978 | 0 | 0 |
| Nov-1978 | 0 | 0 |
| Oct-1978 | 0 | 0 |
| Sep-1978 | 0 | 0 |
| Aug-1978 | 0 | 0 |
| Jun-1978 | 0 | 0 |
| May-1978 | 0 | 0 |
| Apr-1978 | 0 | 0 |
| Mar-1978 | 0 | 0 |
| Feb-1978 | 0 | 0 |
| Jan-1978 | 0 | 0 |
| Dec-1977 | 3.6 | 3.73 |
| Jun-1977 | 3.6 | 3.73 |