Year | Value | 2021 | 70.554 | 2020 | 71.095 | 2019 | 72.161 | 2018 | 71.979 | 2017 | 71.943 | 2016 | 72.058 | 2015 | 73.006 | 2014 | 72.853 | 2013 | 73.196 | 2012 | 73.036 | 2011 | 72.913 | 2010 | 72.89 | 2009 | 72.579 | 2008 | 72.436 | 2007 | 73.058 | 2006 | 72.742 | 2005 | 72.782 | 2004 | 72.514 | 2003 | 71.94 | 2002 | 72.662 | 2001 | 71.201 | 2000 | 72.478 | 1999 | 72.254 | 1998 | 72.668 | 1997 | 72.703 | 1996 | 72.111 | 1995 | 72.143 | 1994 | 71.853 | 1993 | 71.925 | 1992 | 71.806 | 1991 | 71.832 | 1990 | 71.532 | 1989 | 71.348 | 1988 | 71.252 | 1987 | 71.047 | 1986 | 71.037 | 1985 | 70.596 | 1984 | 70.441 | 1983 | 70.197 | 1982 | 69.723 | 1981 | 69.442 | 1980 | 68.762 | 1979 | 68.587 | 1978 | 68.313 | 1977 | 67.957 | 1976 | 67.554 | 1975 | 67.075 | 1974 | 66.526 | 1973 | 65.936 | 1972 | 65.42 | 1971 | 64.933 | 1970 | 64.299 | 1969 | 63.224 | 1968 | 62.928 | 1967 | 62.348 | 1966 | 61.801 | 1965 | 61.248 | 1964 | 60.609 | 1963 | 60.152 | 1962 | 59.529 | 1961 | 59.407 | 1960 | 58.647 |
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