Year | Value | 2021 | 65.267 | 2020 | 65.614 | 2019 | 65.876 | 2018 | 65.681 | 2017 | 65.445 | 2016 | 64.78 | 2015 | 64.659 | 2014 | 64.269 | 2013 | 63.678 | 2012 | 63.792 | 2011 | 63.246 | 2010 | 63.016 | 2009 | 62.644 | 2008 | 61.206 | 2007 | 61.256 | 2006 | 60.281 | 2005 | 57.279 | 2004 | 56.773 | 2003 | 58.2 | 2002 | 58.976 | 2001 | 58.562 | 2000 | 58.319 | 1999 | 57.015 | 1998 | 48.81 | 1997 | 52.833 | 1996 | 52.276 | 1995 | 51.991 | 1994 | 56.644 | 1993 | 46.575 | 1992 | 45.891 | 1991 | 50.213 | 1990 | 49.732 | 1989 | 49.337 | 1988 | 35.923 | 1987 | 43.441 | 1986 | 51.481 | 1985 | 46.458 | 1984 | 46.22 | 1983 | 47.45 | 1982 | 54.321 | 1981 | 54.078 | 1980 | 53.934 | 1979 | 53.559 | 1978 | 53.44 | 1977 | 53.648 | 1976 | 53.462 | 1975 | 53.377 | 1974 | 53.23 | 1973 | 53.069 | 1972 | 49.925 | 1971 | 49.646 | 1970 | 45.534 | 1969 | 45.147 | 1968 | 45.456 | 1967 | 45.056 | 1966 | 44.626 | 1965 | 46.935 | 1964 | 49.457 | 1963 | 46.189 | 1962 | 47.354 | 1961 | 47.023 | 1960 | 46.603 |
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