Year | Value | 2021 | 81.019 | 2020 | 81.273 | 2019 | 81.162 | 2018 | 81.074 | 2017 | 81.058 | 2016 | 80.814 | 2015 | 80.675 | 2014 | 80.406 | 2013 | 80.103 | 2012 | 79.611 | 2011 | 79.188 | 2010 | 78.795 | 2009 | 78.324 | 2008 | 77.829 | 2007 | 77.091 | 2006 | 76.652 | 2005 | 76.307 | 2004 | 74.746 | 2003 | 75.184 | 2002 | 74.209 | 2001 | 73.175 | 2000 | 71.763 | 1999 | 70.975 | 1998 | 70.323 | 1997 | 70.019 | 1996 | 69.451 | 1995 | 68.435 | 1994 | 67.441 | 1993 | 66.648 | 1992 | 65.836 | 1991 | 65.103 | 1990 | 64.307 | 1989 | 63.546 | 1988 | 62.812 | 1987 | 61.998 | 1986 | 61.211 | 1985 | 60.403 | 1984 | 59.42 | 1983 | 58.595 | 1982 | 57.786 | 1981 | 56.894 | 1980 | 56.074 | 1979 | 55.119 | 1978 | 51.516 | 1977 | 53.021 | 1976 | 51.969 | 1975 | 50.844 | 1974 | 49.589 | 1973 | 48.412 | 1972 | 47.232 | 1971 | 46.216 | 1970 | 45.134 | 1969 | 44.391 | 1968 | 43.72 | 1967 | 42.975 | 1966 | 42.289 | 1965 | 41.68 | 1964 | 41.119 | 1963 | 40.522 | 1962 | 39.975 | 1961 | 39.579 | 1960 | 39.086 |
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