Year | Value | 2021 | 68.061 | 2020 | 68.497 | 2019 | 68.138 | 2018 | 67.634 | 2017 | 67.434 | 2016 | 67.167 | 2015 | 66.67 | 2014 | 66.361 | 2013 | 65.718 | 2012 | 65.355 | 2011 | 64.736 | 2010 | 63.973 | 2009 | 63.273 | 2008 | 62.603 | 2007 | 62.084 | 2006 | 61.493 | 2005 | 60.98 | 2004 | 60.293 | 2003 | 60.031 | 2002 | 59.534 | 2001 | 59.07 | 2000 | 58.378 | 1999 | 57.873 | 1998 | 57.665 | 1997 | 57.292 | 1996 | 56.891 | 1995 | 56.385 | 1994 | 55.749 | 1993 | 55.435 | 1992 | 54.952 | 1991 | 54.46 | 1990 | 53.713 | 1989 | 53.252 | 1988 | 52.731 | 1987 | 52.152 | 1986 | 51.699 | 1985 | 51.108 | 1984 | 50.535 | 1983 | 49.957 | 1982 | 49.404 | 1981 | 48.73 | 1980 | 48.082 | 1979 | 46.966 | 1978 | 46.207 | 1977 | 45.973 | 1976 | 45.603 | 1975 | 45.892 | 1974 | 45.532 | 1973 | 44.477 | 1972 | 44.249 | 1971 | 43.983 | 1970 | 43.563 | 1969 | 43.21 | 1968 | 42.984 | 1967 | 42.617 | 1966 | 42.096 | 1965 | 42.056 | 1964 | 41.649 | 1963 | 41.332 | 1962 | 42.009 | 1961 | 41.066 | 1960 | 40.79 |
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