Year | Value | 2022 | 68.335 | 2021 | 67.847 | 2020 | 67.354 | 2019 | 66.856 | 2018 | 66.355 | 2017 | 65.85 | 2016 | 65.341 | 2015 | 64.828 | 2014 | 64.312 | 2013 | 63.793 | 2012 | 63.272 | 2011 | 62.746 | 2010 | 62.218 | 2009 | 61.687 | 2008 | 61.154 | 2007 | 60.616 | 2006 | 60.077 | 2005 | 59.536 | 2004 | 58.993 | 2003 | 58.446 | 2002 | 57.898 | 2001 | 57.368 | 2000 | 56.891 | 1999 | 56.411 | 1998 | 55.93 | 1997 | 55.449 | 1996 | 54.967 | 1995 | 54.486 | 1994 | 54.004 | 1993 | 53.521 | 1992 | 53.038 | 1991 | 52.554 | 1990 | 52.037 | 1989 | 51.505 | 1988 | 50.972 | 1987 | 50.439 | 1986 | 49.905 | 1985 | 49.372 | 1984 | 49.088 | 1983 | 48.922 | 1982 | 48.756 | 1981 | 48.591 | 1980 | 48.425 | 1979 | 48.349 | 1978 | 48.289 | 1977 | 48.229 | 1976 | 48.169 | 1975 | 48.109 | 1974 | 48.049 | 1973 | 47.989 | 1972 | 47.929 | 1971 | 47.869 | 1970 | 47.809 | 1969 | 47.704 | 1968 | 47.59 | 1967 | 47.476 | 1966 | 47.362 | 1965 | 47.248 | 1964 | 47.134 | 1963 | 47.02 | 1962 | 46.906 | 1961 | 46.793 | 1960 | 46.619 |
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