Year | Value | 2021 | 65.821 | 2020 | 66.531 | 2019 | 66.603 | 2018 | 66.306 | 2017 | 66.189 | 2016 | 65.802 | 2015 | 65.46 | 2014 | 64.974 | 2013 | 64.776 | 2012 | 64.587 | 2011 | 64.045 | 2010 | 63.898 | 2009 | 63.303 | 2008 | 63.083 | 2007 | 62.618 | 2006 | 62.375 | 2005 | 61.959 | 2004 | 61.838 | 2003 | 61.671 | 2002 | 61.292 | 2001 | 61.27 | 2000 | 61.069 | 1999 | 60.849 | 1998 | 60.79 | 1997 | 60.662 | 1996 | 60.612 | 1995 | 60.704 | 1994 | 60.701 | 1993 | 60.718 | 1992 | 60.545 | 1991 | 60.397 | 1990 | 60.311 | 1989 | 60.265 | 1988 | 60.006 | 1987 | 59.894 | 1986 | 59.641 | 1985 | 59.311 | 1984 | 58.894 | 1983 | 58.601 | 1982 | 58.106 | 1981 | 57.816 | 1980 | 57.454 | 1979 | 57.053 | 1978 | 56.659 | 1977 | 56.089 | 1976 | 55.569 | 1975 | 55.035 | 1974 | 54.567 | 1973 | 54.057 | 1972 | 53.605 | 1971 | 53.073 | 1970 | 52.555 | 1969 | 51.957 | 1968 | 51.439 | 1967 | 50.892 | 1966 | 50.349 | 1965 | 49.752 | 1964 | 49.048 | 1963 | 48.479 | 1962 | 47.838 | 1961 | 47.228 | 1960 | 46.575 |
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