Year | Value | 2021 | 83.624 | 2020 | 83.423 | 2019 | 83.26 | 2018 | 84.282 | 2017 | 81.55 | 2016 | 82.779 | 2015 | 82.613 | 2014 | 83.008 | 2013 | 82.044 | 2012 | 82.24 | 2011 | 83.25 | 2010 | 81.808 | 2009 | 81.64 | 2008 | 81.472 | 2007 | 81.302 | 2006 | 81.132 | 2005 | 80.961 | 2004 | 80.789 | 2003 | 80.606 | 2002 | 80.432 | 2001 | 80.247 | 2000 | 80.062 | 1999 | 79.884 | 1998 | 79.709 | 1997 | 79.533 | 1996 | 79.356 | 1995 | 79.179 | 1994 | 78.99 | 1993 | 78.811 | 1992 | 78.621 | 1991 | 79.109 | 1990 | 77.789 | 1989 | 77.573 | 1988 | 77.573 | 1987 | 77.017 | 1986 | 76.901 | 1985 | 76.158 | 1984 | 76.348 | 1983 | 76.208 | 1982 | 76.606 | 1981 | 76.07 | 1980 | 75.823 | 1979 | 75.633 | 1978 | 75.415 | 1977 | 75.279 | 1976 | 75.221 | 1975 | 75.092 | 1974 | 74.922 | 1973 | 74.742 | 1972 | 74.514 | 1971 | 74.059 | 1970 | 74.329 | 1969 | 73.953 | 1968 | 73.28 | 1967 | 73.154 | 1966 | 72.385 | 1965 | 71.249 | 1964 | 71.952 | 1963 | 71.911 | 1962 | 70.755 | 1961 | 70.502 | 1960 | 70.707 |
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