Year | Value | 2021 | 64.09 | 2020 | 65.062 | 2019 | 65.275 | 2018 | 65.158 | 2017 | 64.961 | 2016 | 64.204 | 2015 | 64.145 | 2014 | 63.979 | 2013 | 63.194 | 2012 | 63.069 | 2011 | 63.001 | 2010 | 62.376 | 2009 | 62.2 | 2008 | 61.225 | 2007 | 60.211 | 2006 | 59.595 | 2005 | 58.523 | 2004 | 57.44 | 2003 | 56.669 | 2002 | 56.056 | 2001 | 55.614 | 2000 | 55.597 | 1999 | 55.924 | 1998 | 56.082 | 1997 | 56.534 | 1996 | 56.955 | 1995 | 57.425 | 1994 | 58.195 | 1993 | 58.605 | 1992 | 59.35 | 1991 | 59.934 | 1990 | 60.444 | 1989 | 60.699 | 1988 | 61.214 | 1987 | 61.617 | 1986 | 61.767 | 1985 | 62.295 | 1984 | 62.432 | 1983 | 62.733 | 1982 | 62.941 | 1981 | 63.448 | 1980 | 59.962 | 1979 | 59.319 | 1978 | 58.726 | 1977 | 58.148 | 1976 | 57.335 | 1975 | 57.046 | 1974 | 57.257 | 1973 | 57.502 | 1972 | 57.038 | 1971 | 56.128 | 1970 | 55.185 | 1969 | 54.743 | 1968 | 54.398 | 1967 | 53.988 | 1966 | 53.653 | 1965 | 53.303 | 1964 | 52.9 | 1963 | 52.396 | 1962 | 51.799 | 1961 | 51.128 | 1960 | 50.263 |
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