Year | Value | 2021 | 64.935 | 2020 | 65.397 | 2019 | 64.165 | 2018 | 65.267 | 2017 | 65.135 | 2016 | 64.975 | 2015 | 64.314 | 2014 | 64.241 | 2013 | 63.998 | 2012 | 63.325 | 2011 | 63.135 | 2010 | 62.775 | 2009 | 62.008 | 2008 | 61.212 | 2007 | 60.395 | 2006 | 59.514 | 2005 | 58.747 | 2004 | 57.578 | 2003 | 56.557 | 2002 | 55.733 | 2001 | 54.983 | 2000 | 54.377 | 1999 | 53.755 | 1998 | 52.787 | 1997 | 52.122 | 1996 | 54.13 | 1995 | 54.219 | 1994 | 54.364 | 1993 | 54.876 | 1992 | 55.486 | 1991 | 56.653 | 1990 | 57.646 | 1989 | 58.628 | 1988 | 59.487 | 1987 | 60.192 | 1986 | 60.516 | 1985 | 60.428 | 1984 | 60.369 | 1983 | 60.24 | 1982 | 60.1 | 1981 | 59.757 | 1980 | 59.595 | 1979 | 59.196 | 1978 | 59.016 | 1977 | 58.614 | 1976 | 58.475 | 1975 | 58.102 | 1974 | 57.925 | 1973 | 57.571 | 1972 | 57.161 | 1971 | 56.855 | 1970 | 56.404 | 1969 | 55.996 | 1968 | 55.488 | 1967 | 54.729 | 1966 | 54.481 | 1965 | 53.891 | 1964 | 53.343 | 1963 | 52.758 | 1962 | 52.128 | 1961 | 51.296 | 1960 | 50.542 |
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