1978 – 1979,705.0,
1979 – 1980,610.5,
1980 – 1981,493.6,
1981 – 1982,397.1,
1982 – 1983,351.5,
1983 – 1984,319.2,
1984 – 1985,288.2,
1985 – 1986,264.2,
1986 – 1987,234.4,
1987 – 1988,211.3,
1988 – 1989,186.4,
1989 – 1990,158.5,
1990 – 1991,140.9,
1991 – 1992,118.8,
1992 – 1993,105.5,
1993 – 1994,95.7,
1994 – 1995,89.8,
1995 – 1996,81.8,
1996 – 1997,76.8,
1997 – 1998,68.4,
1998 – 1999,61.0,
1999 – 2000,54.5,
2000 – 2001,45.4,
2001 – 2002,39.8,
2002 – 2003,34.0,
2003 – 2004,29.4,
2004 – 2005,24.6,
2005 – 2006,19.7,
2006 – 2007,15.8,
2007 – 2008,11.2,
2008 – 2009,6.7,
2009 – 2010,3.5,
2010 – 2011,2.3,