Year | Value | 2021 | 79.811 | 2020 | 81.912 | 2019 | 81.953 | 2018 | 82.083 | 2017 | 81.76 | 2016 | 82.008 | 2015 | 81.569 | 2014 | 81.236 | 2013 | 81.762 | 2012 | 81.62 | 2011 | 81.711 | 2010 | 81.083 | 2009 | 81.236 | 2008 | 81.016 | 2007 | 80.934 | 2006 | 81.064 | 2005 | 80.862 | 2004 | 80.635 | 2003 | 80.412 | 2002 | 80.374 | 2001 | 79.893 | 2000 | 80.038 | 1999 | 79.738 | 1998 | 79.253 | 1997 | 79.661 | 1996 | 79.063 | 1995 | 78.981 | 1994 | 78.892 | 1993 | 78.822 | 1992 | 78.68 | 1991 | 78.49 | 1990 | 78.767 | 1989 | 78.537 | 1988 | 78.129 | 1987 | 77.676 | 1986 | 77.42 | 1985 | 77.136 | 1984 | 76.935 | 1983 | 76.726 | 1982 | 76.584 | 1981 | 75.419 | 1980 | 75.244 | 1979 | 74.611 | 1978 | 74.465 | 1977 | 73.675 | 1976 | 72.556 | 1975 | 71.769 | 1974 | 71.028 | 1973 | 70.297 | 1972 | 69.152 | 1971 | 68.769 | 1970 | 67.74 | 1969 | 67.522 | 1968 | 66.545 | 1967 | 65.922 | 1966 | 65.303 | 1965 | 64.904 | 1964 | 64.075 | 1963 | 63.339 | 1962 | 62.849 | 1961 | 62.621 | 1960 | 62.122 |
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