Year | Value | 2022 | 74.01 | 2021 | 73.561 | 2020 | 73.1 | 2019 | 72.627 | 2018 | 72.143 | 2017 | 71.646 | 2016 | 71.138 | 2015 | 70.616 | 2014 | 70.083 | 2013 | 69.544 | 2012 | 69 | 2011 | 67.488 | 2010 | 65.94 | 2009 | 64.358 | 2008 | 62.745 | 2007 | 61.1 | 2006 | 59.431 | 2005 | 57.74 | 2004 | 56.033 | 2003 | 54.307 | 2002 | 52.573 | 2001 | 50.832 | 2000 | 49.092 | 1999 | 47.35 | 1998 | 45.616 | 1997 | 43.893 | 1996 | 42.187 | 1995 | 40.494 | 1994 | 38.831 | 1993 | 37.792 | 1992 | 36.766 | 1991 | 35.748 | 1990 | 34.745 | 1989 | 33.755 | 1988 | 32.78 | 1987 | 31.817 | 1986 | 30.871 | 1985 | 29.94 | 1984 | 29.028 | 1983 | 28.151 | 1982 | 28.058 | 1981 | 27.965 | 1980 | 27.872 | 1979 | 27.779 | 1978 | 27.687 | 1977 | 27.594 | 1976 | 27.502 | 1975 | 27.41 | 1974 | 27.319 | 1973 | 27.227 | 1972 | 27.136 | 1971 | 27.045 | 1970 | 26.954 | 1969 | 26.863 | 1968 | 26.773 | 1967 | 26.682 | 1966 | 26.592 | 1965 | 26.502 | 1964 | 26.413 | 1963 | 26.323 | 1962 | 26.234 | 1961 | 26.144 | 1960 | 25.537 |
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