Year | Value | 2021 | 62.666 | 2020 | 62.781 | 2019 | 63.777 | 2018 | 63.594 | 2017 | 63.284 | 2016 | 63.11 | 2015 | 62.761 | 2014 | 62.588 | 2013 | 62.218 | 2012 | 61.956 | 2011 | 61.656 | 2010 | 61.468 | 2009 | 61.07 | 2008 | 60.634 | 2007 | 60.477 | 2006 | 60.181 | 2005 | 59.892 | 2004 | 59.879 | 2003 | 59.655 | 2002 | 59.648 | 2001 | 59.606 | 2000 | 59.435 | 1999 | 59.185 | 1998 | 58.874 | 1997 | 58.834 | 1996 | 58.523 | 1995 | 58.765 | 1994 | 58.903 | 1993 | 59.046 | 1992 | 58.871 | 1991 | 58.524 | 1990 | 58.303 | 1989 | 57.698 | 1988 | 57.625 | 1987 | 57.046 | 1986 | 56.419 | 1985 | 55.913 | 1984 | 55.459 | 1983 | 54.927 | 1982 | 54.506 | 1981 | 53.95 | 1980 | 53.389 | 1979 | 52.863 | 1978 | 52.282 | 1977 | 51.797 | 1976 | 51.33 | 1975 | 50.997 | 1974 | 50.608 | 1973 | 50.338 | 1972 | 50.187 | 1971 | 50.019 | 1970 | 49.806 | 1969 | 49.572 | 1968 | 49.081 | 1967 | 48.501 | 1966 | 47.936 | 1965 | 47.311 | 1964 | 46.754 | 1963 | 46.056 | 1962 | 45.495 | 1961 | 44.949 | 1960 | 44.277 |
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