Year | Value | 2021 | 71.815 | 2020 | 71.609 | 2019 | 71.391 | 2018 | 71.129 | 2017 | 70.847 | 2016 | 70.602 | 2015 | 70.343 | 2014 | 70.049 | 2013 | 69.707 | 2012 | 69.326 | 2011 | 68.881 | 2010 | 68.43 | 2009 | 67.897 | 2008 | 67.499 | 2007 | 66.954 | 2006 | 66.362 | 2005 | 65.805 | 2004 | 65.268 | 2003 | 64.696 | 2002 | 64.078 | 2001 | 63.444 | 2000 | 62.01 | 1999 | 62.23 | 1998 | 61.549 | 1997 | 60.852 | 1996 | 60.212 | 1995 | 59.516 | 1994 | 58.635 | 1993 | 58.117 | 1992 | 57.423 | 1991 | 56.642 | 1990 | 55.968 | 1989 | 55.261 | 1988 | 54.513 | 1987 | 53.72 | 1986 | 52.919 | 1985 | 52.118 | 1984 | 51.4 | 1983 | 50.637 | 1982 | 49.853 | 1981 | 49.034 | 1980 | 48.218 | 1979 | 47.411 | 1978 | 46.599 | 1977 | 45.789 | 1976 | 44.947 | 1975 | 44.09 | 1974 | 43.265 | 1973 | 42.451 | 1972 | 41.586 | 1971 | 40.753 | 1970 | 39.953 | 1969 | 39.127 | 1968 | 38.266 | 1967 | 37.584 | 1966 | 36.901 | 1965 | 36.24 | 1964 | 35.618 | 1963 | 35.029 | 1962 | 34.469 | 1961 | 33.946 | 1960 | 33.465 |
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