Year | Value | 2021 | 66.154 | 2020 | 66.519 | 2019 | 66.155 | 2018 | 65.793 | 2017 | 65.512 | 2016 | 65.122 | 2015 | 64.739 | 2014 | 64.346 | 2013 | 63.877 | 2012 | 63.451 | 2011 | 62.969 | 2010 | 61.917 | 2009 | 61.232 | 2008 | 60.715 | 2007 | 60.013 | 2006 | 59.405 | 2005 | 58.94 | 2004 | 58.302 | 2003 | 58.14 | 2002 | 57.833 | 2001 | 57.427 | 2000 | 56.839 | 1999 | 56.41 | 1998 | 56.025 | 1997 | 55.682 | 1996 | 55.374 | 1995 | 54.901 | 1994 | 54.307 | 1993 | 53.997 | 1992 | 53.55 | 1991 | 53.124 | 1990 | 52.335 | 1989 | 51.906 | 1988 | 51.507 | 1987 | 51.046 | 1986 | 50.658 | 1985 | 50.098 | 1984 | 49.547 | 1983 | 49.029 | 1982 | 48.514 | 1981 | 47.728 | 1980 | 47.085 | 1979 | 45.812 | 1978 | 44.908 | 1977 | 44.744 | 1976 | 44.392 | 1975 | 44.765 | 1974 | 44.441 | 1973 | 42.524 | 1972 | 42.282 | 1971 | 41.913 | 1970 | 41.488 | 1969 | 41.134 | 1968 | 40.834 | 1967 | 40.524 | 1966 | 39.971 | 1965 | 39.898 | 1964 | 39.53 | 1963 | 39.241 | 1962 | 40.756 | 1961 | 39.348 | 1960 | 39.143 |
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