Year | Value | 2021 | 66.536 | 2020 | 67.133 | 2019 | 67.3 | 2018 | 67.067 | 2017 | 66.577 | 2016 | 66.289 | 2015 | 66.033 | 2014 | 65.6 | 2013 | 65.067 | 2012 | 64.838 | 2011 | 64.402 | 2010 | 63.787 | 2009 | 63.328 | 2008 | 62.573 | 2007 | 62.116 | 2006 | 61.611 | 2005 | 60.597 | 2004 | 59.899 | 2003 | 59.409 | 2002 | 58.811 | 2001 | 58.298 | 2000 | 56.111 | 1999 | 43.397 | 1998 | 49.158 | 1997 | 56.312 | 1996 | 55.756 | 1995 | 54.914 | 1994 | 54.1 | 1993 | 53.234 | 1992 | 52.465 | 1991 | 50.607 | 1990 | 49.769 | 1989 | 47.828 | 1988 | 48.015 | 1987 | 47.333 | 1986 | 47.075 | 1985 | 46.145 | 1984 | 45.777 | 1983 | 45.323 | 1982 | 44.86 | 1981 | 44.905 | 1980 | 44.585 | 1979 | 43.972 | 1978 | 43.561 | 1977 | 43.175 | 1976 | 42.656 | 1975 | 42.24 | 1974 | 42.243 | 1973 | 42.252 | 1972 | 41.848 | 1971 | 41.483 | 1970 | 41.09 | 1969 | 40.722 | 1968 | 40.38 | 1967 | 40.09 | 1966 | 39.882 | 1965 | 39.554 | 1964 | 39.24 | 1963 | 38.774 | 1962 | 38.393 | 1961 | 37.974 | 1960 | 37.5 |
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