Year | Value | 2021 | 63.795 | 2020 | 64.114 | 2019 | 64.74 | 2018 | 64.122 | 2017 | 64.013 | 2016 | 63.89 | 2015 | 63.175 | 2014 | 63.045 | 2013 | 62.42 | 2012 | 62.081 | 2011 | 61.652 | 2010 | 61.157 | 2009 | 60.946 | 2008 | 60.49 | 2007 | 60.224 | 2006 | 59.988 | 2005 | 59.76 | 2004 | 59.191 | 2003 | 59.111 | 2002 | 58.608 | 2001 | 58.107 | 2000 | 58.195 | 1999 | 58.03 | 1998 | 57.6 | 1997 | 57.199 | 1996 | 56.82 | 1995 | 56.565 | 1994 | 56.112 | 1993 | 56.416 | 1992 | 56.231 | 1991 | 56.012 | 1990 | 55.62 | 1989 | 55.191 | 1988 | 54.507 | 1987 | 53.824 | 1986 | 53.125 | 1985 | 52.416 | 1984 | 52.051 | 1983 | 51.622 | 1982 | 51.383 | 1981 | 51.269 | 1980 | 51.117 | 1979 | 50.932 | 1978 | 50.571 | 1977 | 50.085 | 1976 | 49.764 | 1975 | 49.246 | 1974 | 48.777 | 1973 | 48.398 | 1972 | 48.026 | 1971 | 47.798 | 1970 | 47.805 | 1969 | 47.565 | 1968 | 47.57 | 1967 | 47.683 | 1966 | 47.727 | 1965 | 47.778 | 1964 | 47.719 | 1963 | 47.578 | 1962 | 47.405 | 1961 | 47.325 | 1960 | 47.096 |
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