Year | Value | 2021 | 79.553 | 2020 | 79.268 | 2019 | 81.326 | 2018 | 81.028 | 2017 | 81.264 | 2016 | 81.494 | 2015 | 81.632 | 2014 | 81.694 | 2013 | 81.433 | 2012 | 81.043 | 2011 | 80.48 | 2010 | 80.274 | 2009 | 80.223 | 2008 | 79.412 | 2007 | 78.301 | 2006 | 77.141 | 2005 | 77.276 | 2004 | 76.962 | 2003 | 76.639 | 2002 | 76.312 | 2001 | 76.109 | 2000 | 75.773 | 1999 | 75.018 | 1998 | 74.514 | 1997 | 74.766 | 1996 | 74.443 | 1995 | 74.111 | 1994 | 73.794 | 1993 | 73.475 | 1992 | 73.135 | 1991 | 72.813 | 1990 | 72.489 | 1989 | 72.165 | 1988 | 71.841 | 1987 | 71.513 | 1986 | 71.15 | 1985 | 70.855 | 1984 | 70.588 | 1983 | 70.202 | 1982 | 69.831 | 1981 | 69.508 | 1980 | 69.231 | 1979 | 68.912 | 1978 | 68.561 | 1977 | 68.241 | 1976 | 67.934 | 1975 | 67.624 | 1974 | 67.358 | 1973 | 66.994 | 1972 | 66.676 | 1971 | 66.353 | 1970 | 66.037 | 1969 | 65.719 | 1968 | 65.405 | 1967 | 65.088 | 1966 | 64.774 | 1965 | 64.467 | 1964 | 64.153 | 1963 | 63.945 | 1962 | 63.629 | 1961 | 63.332 | 1960 | 62.931 |
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