Year | Value | 2022 | 68.736 | 2021 | 68.283 | 2020 | 67.829 | 2019 | 67.373 | 2018 | 66.916 | 2017 | 66.459 | 2016 | 66.001 | 2015 | 65.543 | 2014 | 65.085 | 2013 | 64.627 | 2012 | 64.169 | 2011 | 63.712 | 2010 | 63.256 | 2009 | 62.8 | 2008 | 62.346 | 2007 | 61.893 | 2006 | 61.441 | 2005 | 60.988 | 2004 | 60.533 | 2003 | 60.076 | 2002 | 59.617 | 2001 | 59.156 | 2000 | 58.695 | 1999 | 58.231 | 1998 | 57.766 | 1997 | 57.299 | 1996 | 56.832 | 1995 | 56.413 | 1994 | 55.996 | 1993 | 55.58 | 1992 | 55.162 | 1991 | 54.743 | 1990 | 54.324 | 1989 | 53.905 | 1988 | 53.485 | 1987 | 53.064 | 1986 | 52.642 | 1985 | 52.221 | 1984 | 51.56 | 1983 | 50.633 | 1982 | 49.707 | 1981 | 48.781 | 1980 | 47.857 | 1979 | 46.932 | 1978 | 46.01 | 1977 | 45.091 | 1976 | 44.177 | 1975 | 43.264 | 1974 | 42.357 | 1973 | 41.514 | 1972 | 40.715 | 1971 | 39.919 | 1970 | 39.129 | 1969 | 38.345 | 1968 | 37.569 | 1967 | 36.796 | 1966 | 36.031 | 1965 | 35.273 | 1964 | 34.524 | 1963 | 33.78 | 1962 | 33.045 | 1961 | 32.318 | 1960 | 31.601 |
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