1978 100
1979 107.6
1980 116
1981 122.1
1982 133.1
1983 147.6
1984 170
1985 192.9
1986 210
1987 234.3
1988 260.7
1989 271.3
1990 281.7
1991 307.6
1992 351.4
1993 400.4
1994 452.8
1995 502.3
1996 552.6
1997 603.9
1998 651.2
1999 709
2000 759.9
2001 823
2002 897.8
2003 987.8
2004 1087.4
2005 1198.7