Year | Value | 2021 | 79.258 | 2020 | 81.911 | 2019 | 81.296 | 2018 | 81.283 | 2017 | 81.316 | 2016 | 81.356 | 2015 | 81.386 | 2014 | 81.36 | 2013 | 81.28 | 2012 | 81.165 | 2011 | 81.032 | 2010 | 80.897 | 2009 | 80.776 | 2008 | 80.675 | 2007 | 80.58 | 2006 | 80.488 | 2005 | 80.376 | 2004 | 80.263 | 2003 | 80.119 | 2002 | 79.949 | 2001 | 79.761 | 2000 | 79.546 | 1999 | 79.308 | 1998 | 79.053 | 1997 | 78.789 | 1996 | 78.526 | 1995 | 78.273 | 1994 | 78.039 | 1993 | 77.826 | 1992 | 77.625 | 1991 | 77.431 | 1990 | 77.236 | 1989 | 77.034 | 1988 | 76.819 | 1987 | 76.586 | 1986 | 76.329 | 1985 | 76.047 | 1984 | 75.738 | 1983 | 75.406 | 1982 | 75.063 | 1981 | 74.72 | 1980 | 74.388 | 1979 | 74.081 | 1978 | 73.805 | 1977 | 73.558 | 1976 | 73.34 | 1975 | 73.15 | 1974 | 72.991 | 1973 | 72.859 | 1972 | 72.734 | 1971 | 72.634 | 1970 | 72.519 | 1969 | 72.386 | 1968 | 72.235 | 1967 | 72.066 | 1966 | 71.912 | 1965 | 71.76 | 1964 | 71.628 | 1963 | 71.518 | 1962 | 71.414 | 1961 | 71.303 | 1960 | 71.169 |
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