Year | Value | 2021 | 66.005 | 2020 | 68.258 | 2019 | 70.439 | 2018 | 69.896 | 2017 | 69.613 | 2016 | 69.359 | 2015 | 69.075 | 2014 | 68.882 | 2013 | 68.591 | 2012 | 68.265 | 2011 | 67.907 | 2010 | 67.55 | 2009 | 67.245 | 2008 | 66.907 | 2007 | 66.618 | 2006 | 66.307 | 2005 | 65.737 | 2004 | 65.645 | 2003 | 65.286 | 2002 | 64.887 | 2001 | 64.467 | 2000 | 63.983 | 1999 | 63.421 | 1998 | 62.713 | 1997 | 62.135 | 1996 | 61.502 | 1995 | 60.861 | 1994 | 60.473 | 1993 | 60.216 | 1992 | 59.737 | 1991 | 59.676 | 1990 | 59.622 | 1989 | 59.69 | 1988 | 59.468 | 1987 | 58.857 | 1986 | 58.114 | 1985 | 57.56 | 1984 | 56.862 | 1983 | 55.817 | 1982 | 44.787 | 1981 | 51.964 | 1980 | 52.577 | 1979 | 53.2 | 1978 | 53.245 | 1977 | 53.534 | 1976 | 48.052 | 1975 | 53.08 | 1974 | 52.478 | 1973 | 51.532 | 1972 | 50.031 | 1971 | 48.868 | 1970 | 47.805 | 1969 | 46.934 | 1968 | 46.871 | 1967 | 46.736 | 1966 | 46.619 | 1965 | 46.84 | 1964 | 46.946 | 1963 | 46.747 | 1962 | 46.434 | 1961 | 45.985 | 1960 | 45.369 |
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