Year | Value | 2021 | 68.931 | 2020 | 68.791 | 2019 | 69.032 | 2018 | 68.786 | 2017 | 68.582 | 2016 | 68.367 | 2015 | 68.131 | 2014 | 67.741 | 2013 | 67.668 | 2012 | 67.514 | 2011 | 67.301 | 2010 | 67.101 | 2009 | 66.799 | 2008 | 66.696 | 2007 | 66.286 | 2006 | 66.296 | 2005 | 66.1 | 2004 | 65.927 | 2003 | 65.724 | 2002 | 65.56 | 2001 | 65.354 | 2000 | 65.183 | 1999 | 64.974 | 1998 | 64.793 | 1997 | 64.563 | 1996 | 64.384 | 1995 | 64.116 | 1994 | 63.882 | 1993 | 63.62 | 1992 | 63.385 | 1991 | 63.166 | 1990 | 62.933 | 1989 | 62.707 | 1988 | 62.472 | 1987 | 62.248 | 1986 | 61.415 | 1985 | 61.761 | 1984 | 61.489 | 1983 | 61.268 | 1982 | 61.047 | 1981 | 60.738 | 1980 | 60.443 | 1979 | 60.086 | 1978 | 59.718 | 1977 | 58.828 | 1976 | 58.752 | 1975 | 56.511 | 1974 | 57.63 | 1973 | 56.995 | 1972 | 56.301 | 1971 | 55.555 | 1970 | 54.723 | 1969 | 53.879 | 1968 | 53.014 | 1967 | 52.024 | 1966 | 51.265 | 1965 | 50.462 | 1964 | 49.626 | 1963 | 48.797 | 1962 | 47.995 | 1961 | 47.129 | 1960 | 46.356 |
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