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INDEX SCORES, 1970-2005:
| Year |
Score |
| 1970 | 65.7 |
| 1971 | 65.4 |
| 1972 | 67.5 |
| 1973 | 69.6 |
| 1974 | 66.5 |
| 1975 | 60.8 |
| 1976 | 64.9 |
| 1977 | 61.3 |
| 1978 | 60.5 |
| 1979 | 55.3 |
| 1980 | 50.2 |
| 1981 | 46.6 |
| 1982 | 41.6 |
| 1983 | 44.2 |
| 1984 | 48.8 |
| 1985 | 48.5 |
| 1986 | 48.1 |
| 1987 | 51.6 |
| 1988 | 48.4 |
| 1989 | 49.3 |
| 1990 | 48.5 |
| 1991 | 46.4 |
| 1992 | 46.6 |
| 1993 | 43.2 |
| 1994 | 45.1 |
| 1995 | 48.9 |
| 1996 | 50.7 |
| 1997 | 52.5 |
| 1998 | 54.0 |
| 1999 | 59.6 |
| 2000 | 60.0 |
| 2001 | 56.4 |
| 2002 | 54.9 |
| 2003 | 54.8 |
| 2004 | 53.5 |
| 2005 | 53.2 |