Year | Value | 2021 | 66.819 | 2020 | 67.999 | 2019 | 68.4 | 2018 | 68.226 | 2017 | 68.213 | 2016 | 67.658 | 2015 | 67.586 | 2014 | 67.446 | 2013 | 66.802 | 2012 | 66.652 | 2011 | 65.957 | 2010 | 65.436 | 2009 | 65.155 | 2008 | 64.299 | 2007 | 63.603 | 2006 | 62.945 | 2005 | 62.213 | 2004 | 61.48 | 2003 | 60.238 | 2002 | 58.973 | 2001 | 57.863 | 2000 | 56.559 | 1999 | 55.643 | 1998 | 54.991 | 1997 | 54.708 | 1996 | 54.132 | 1995 | 54.233 | 1994 | 53.853 | 1993 | 53.711 | 1992 | 53.568 | 1991 | 53.234 | 1990 | 52.578 | 1989 | 51.808 | 1988 | 51.679 | 1987 | 50.597 | 1986 | 47.312 | 1985 | 46.569 | 1984 | 45.724 | 1983 | 44.946 | 1982 | 44.145 | 1981 | 43.587 | 1980 | 43.174 | 1979 | 34.827 | 1978 | 29.851 | 1977 | 25.663 | 1976 | 10.493 | 1975 | 10.054 | 1974 | 33.292 | 1973 | 33.461 | 1972 | 33.557 | 1971 | 32.98 | 1970 | 32.64 | 1969 | 43.741 | 1968 | 43.344 | 1967 | 43.102 | 1966 | 43.131 | 1965 | 42.625 | 1964 | 42.187 | 1963 | 41.8 | 1962 | 41.278 | 1961 | 40.786 | 1960 | 40.546 |
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