Year | Value | 2021 | 68.164 | 2020 | 68.996 | 2019 | 68.48 | 2018 | 68.266 | 2017 | 68.104 | 2016 | 67.924 | 2015 | 67.16 | 2014 | 66.906 | 2013 | 66.089 | 2012 | 65.873 | 2011 | 65.09 | 2010 | 64.181 | 2009 | 63.403 | 2008 | 62.523 | 2007 | 61.158 | 2006 | 59.802 | 2005 | 58.206 | 2004 | 56.236 | 2003 | 54.007 | 2002 | 51.87 | 2001 | 50.11 | 2000 | 48.281 | 1999 | 45.794 | 1998 | 43.651 | 1997 | 42.451 | 1996 | 42.153 | 1995 | 41.756 | 1994 | 15.663 | 1993 | 44.668 | 1992 | 46.711 | 1991 | 48.741 | 1990 | 50.473 | 1989 | 51.744 | 1988 | 52.678 | 1987 | 53.483 | 1986 | 53.428 | 1985 | 53.444 | 1984 | 53.199 | 1983 | 52.779 | 1982 | 52.04 | 1981 | 50.736 | 1980 | 49.194 | 1979 | 47.779 | 1978 | 46.347 | 1977 | 45.479 | 1976 | 45.17 | 1975 | 44.987 | 1974 | 45.615 | 1973 | 46.213 | 1972 | 46.916 | 1971 | 47.257 | 1970 | 47.587 | 1969 | 47.844 | 1968 | 48.233 | 1967 | 48.592 | 1966 | 48.68 | 1965 | 48.8 | 1964 | 48.827 | 1963 | 45.3 | 1962 | 48.51 | 1961 | 48.208 | 1960 | 47.727 |
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