Year | Value | 2021 | 72.396 | 2020 | 74.944 | 2019 | 75.58 | 2018 | 76.863 | 2017 | 77.052 | 2016 | 77.102 | 2015 | 77.259 | 2014 | 77.427 | 2013 | 76.548 | 2012 | 77.046 | 2011 | 77.318 | 2010 | 77.55 | 2009 | 77.921 | 2008 | 78.117 | 2007 | 77.428 | 2006 | 76.82 | 2005 | 76.2 | 2004 | 75.555 | 2003 | 75.118 | 2002 | 75.308 | 2001 | 74.859 | 2000 | 74.172 | 1999 | 74.049 | 1998 | 73.352 | 1997 | 72.912 | 1996 | 73.42 | 1995 | 74.155 | 1994 | 74.025 | 1993 | 74.582 | 1992 | 75.061 | 1991 | 75.677 | 1990 | 74.983 | 1989 | 75.103 | 1988 | 74.479 | 1987 | 73.443 | 1986 | 73.015 | 1985 | 72.738 | 1984 | 72.464 | 1983 | 72.269 | 1982 | 71.954 | 1981 | 71.942 | 1980 | 71.839 | 1979 | 71.598 | 1978 | 71.779 | 1977 | 72.058 | 1976 | 71.79 | 1975 | 71.888 | 1974 | 71.605 | 1973 | 71.061 | 1972 | 70.792 | 1971 | 71.066 | 1970 | 70.856 | 1969 | 70.39 | 1968 | 69.658 | 1967 | 68.713 | 1966 | 67.719 | 1965 | 66.262 | 1964 | 64.676 | 1963 | 63.077 | 1962 | 61.385 | 1961 | 59.898 | 1960 | 58.257 |
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