1981 530.5 1982 349.0 1983 739.5 1984 453.0 1985 468.5 1986 619.5 1987 373.5 1988 553.0 1989 465.5 1990 564.5 1991 546.0 1992 536.0 1993 500.0 1994 515.0 1995 511.0 1996 611.5 1997 515.0 1998 589.0 1999 439.0 2000 576.0 2001 528.5 2002 682.0 2003 391.0 2004 489.5 2005 482.0 2006 470.5 2007 502.5 2008 546.5 2009 505.0 2010 698.5