Year | Value | 2021 | 72.608 | 2020 | 73.39 | 2019 | 73.711 | 2018 | 73.927 | 2017 | 73.974 | 2016 | 73.552 | 2015 | 73.081 | 2014 | 73.163 | 2013 | 72.82 | 2012 | 72.745 | 2011 | 72.605 | 2010 | 72.318 | 2009 | 72.087 | 2008 | 71.93 | 2007 | 71.706 | 2006 | 71.49 | 2005 | 71.226 | 2004 | 70.914 | 2003 | 70.659 | 2002 | 70.735 | 2001 | 70.431 | 2000 | 70.095 | 1999 | 69.62 | 1998 | 69.364 | 1997 | 69.242 | 1996 | 68.751 | 1995 | 68.304 | 1994 | 67.687 | 1993 | 67.137 | 1992 | 66.743 | 1991 | 66.504 | 1990 | 65.972 | 1989 | 65.326 | 1988 | 64.889 | 1987 | 63.916 | 1986 | 63.084 | 1985 | 62.371 | 1984 | 61.545 | 1983 | 60.815 | 1982 | 59.823 | 1981 | 58.921 | 1980 | 58.602 | 1979 | 57.853 | 1978 | 57.077 | 1977 | 56.296 | 1976 | 55.575 | 1975 | 54.753 | 1974 | 53.937 | 1973 | 53.247 | 1972 | 52.817 | 1971 | 52.454 | 1970 | 52.203 | 1969 | 51.994 | 1968 | 51.902 | 1967 | 51.72 | 1966 | 51.439 | 1965 | 50.949 | 1964 | 50.313 | 1963 | 49.5 | 1962 | 48.654 | 1961 | 47.817 | 1960 | 47.255 |
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