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INDEX SCORES, 1970-2011:
| Year |
Score |
| 1970 |
64.0 |
| 1971 |
63.6 |
| 1972 |
65.3 |
| 1973 |
66.9 |
| 1974 |
64.0 |
| 1975 |
57.4 |
| 1976 |
60.9 |
| 1977 |
57.6 |
| 1978 |
58.1 |
| 1979 |
53.6 |
| 1980 |
48.3 |
| 1981 |
45.1 |
| 1982 |
40.4 |
| 1983 |
42.8 |
| 1984 |
46.7 |
| 1985 |
46.8 |
| 1986 |
46.5 |
| 1987 |
49.9 |
| 1988 |
47.9 |
| 1989 |
48.4 |
| 1990 |
47.2 |
| 1991 |
45.1 |
| 1992 |
44.3 |
| 1993 |
41.0 |
| 1994 |
43.1 |
| 1995 |
45.4 |
| 1996 |
48.3 |
| 1997 |
53.5 |
| 1998 |
54.8 |
| 1999 |
61.8 |
| 2000 |
62.9 |
| 2001 |
59.7 |
| 2002 |
57.3 |
| 2003 |
56.3 |
| 2004 |
53.7 |
| 2005 |
55.1 |
| 2006 |
57.2 |
| 2007 |
57.2 |
| 2008 |
53.4 |
| 2009 |
50.4 |
| 2010 |
48.5 |
| 2011 |
50.2 |