Year | Value | 2021 | 82.531 | 2020 | 82.536 | 2019 | 82.629 | 2018 | 82.488 | 2017 | 82.354 | 2016 | 82.21 | 2015 | 80.762 | 2014 | 81.939 | 2013 | 81.793 | 2012 | 81.657 | 2011 | 81.509 | 2010 | 81.371 | 2009 | 81.043 | 2008 | 80.846 | 2007 | 79.322 | 2006 | 79.622 | 2005 | 79.786 | 2004 | 79.186 | 2003 | 77.534 | 2002 | 77.905 | 2001 | 77.521 | 2000 | 77.363 | 1999 | 76.29 | 1998 | 76.726 | 1997 | 77.242 | 1996 | 76.981 | 1995 | 76.383 | 1994 | 76.817 | 1993 | 75.771 | 1992 | 77.437 | 1991 | 76.89 | 1990 | 76.562 | 1989 | 75.418 | 1988 | 75.725 | 1987 | 75.305 | 1986 | 74.993 | 1985 | 74.352 | 1984 | 74.717 | 1983 | 74.563 | 1982 | 74.034 | 1981 | 74.024 | 1980 | 73.354 | 1979 | 72.929 | 1978 | 72.662 | 1977 | 72.55 | 1976 | 72.354 | 1975 | 72.233 | 1974 | 71.533 | 1973 | 71.864 | 1972 | 70.948 | 1971 | 71.465 | 1970 | 71.219 | 1969 | 70.822 | 1968 | 71.093 | 1967 | 71.358 | 1966 | 70.717 | 1965 | 70.539 | 1964 | 70.427 | 1963 | 69.211 | 1962 | 69.745 | 1961 | 69.219 | 1960 | 69.743 |
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