Year | Value | 2021 | 66.1 | 2020 | 66.837 | 2019 | 66.721 | 2018 | 66.468 | 2017 | 66.188 | 2016 | 65.869 | 2015 | 65.539 | 2014 | 65.171 | 2013 | 64.84 | 2012 | 64.522 | 2011 | 64.167 | 2010 | 63.769 | 2009 | 63.314 | 2008 | 62.783 | 2007 | 62.208 | 2006 | 61.588 | 2005 | 60.839 | 2004 | 60.129 | 2003 | 59.42 | 2002 | 58.705 | 2001 | 57.929 | 2000 | 57.158 | 1999 | 42.826 | 1998 | 47.503 | 1997 | 47.879 | 1996 | 47.283 | 1995 | 46.537 | 1994 | 46.792 | 1993 | 45.765 | 1992 | 44.803 | 1991 | 43.501 | 1990 | 43.532 | 1989 | 42.984 | 1988 | 30.01 | 1987 | 29.8 | 1986 | 28.686 | 1985 | 28.163 | 1984 | 28.011 | 1983 | 26.279 | 1982 | 25.564 | 1981 | 24.538 | 1980 | 23.599 | 1979 | 18.991 | 1978 | 18.46 | 1977 | 20.517 | 1976 | 21.736 | 1975 | 20.879 | 1974 | 35.362 | 1973 | 37.368 | 1972 | 36.697 | 1971 | 36.103 | 1970 | 35.549 | 1969 | 35.098 | 1968 | 34.624 | 1967 | 34.139 | 1966 | 33.403 | 1965 | 32.759 | 1964 | 32.011 | 1963 | 31.67 | 1962 | 31.361 | 1961 | 30.976 | 1960 | 30.596 |
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