Year | Value | 2021 | 63.488 | 2020 | 64.258 | 2019 | 64.581 | 2018 | 64.115 | 2017 | 63.952 | 2016 | 63.837 | 2015 | 63.357 | 2014 | 62.937 | 2013 | 62.762 | 2012 | 62.608 | 2011 | 62.157 | 2010 | 62.082 | 2009 | 61.591 | 2008 | 61.475 | 2007 | 61.203 | 2006 | 61.018 | 2005 | 60.722 | 2004 | 60.637 | 2003 | 60.374 | 2002 | 60.186 | 2001 | 60.179 | 2000 | 59.896 | 1999 | 59.874 | 1998 | 59.867 | 1997 | 59.586 | 1996 | 59.539 | 1995 | 59.609 | 1994 | 59.611 | 1993 | 59.54 | 1992 | 59.443 | 1991 | 59.098 | 1990 | 58.964 | 1989 | 58.809 | 1988 | 58.524 | 1987 | 58.287 | 1986 | 58.073 | 1985 | 57.648 | 1984 | 57.259 | 1983 | 56.927 | 1982 | 56.411 | 1981 | 56.002 | 1980 | 55.716 | 1979 | 55.263 | 1978 | 54.864 | 1977 | 54.369 | 1976 | 53.853 | 1975 | 53.353 | 1974 | 52.892 | 1973 | 52.392 | 1972 | 51.996 | 1971 | 51.492 | 1970 | 50.943 | 1969 | 50.303 | 1968 | 49.823 | 1967 | 49.285 | 1966 | 48.781 | 1965 | 48.199 | 1964 | 47.423 | 1963 | 46.976 | 1962 | 46.333 | 1961 | 45.702 | 1960 | 45.026 |
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