Year | Value | 2021 | 70.986 | 2020 | 70.928 | 2019 | 70.871 | 2018 | 70.779 | 2017 | 70.713 | 2016 | 70.661 | 2015 | 70.607 | 2014 | 70.54 | 2013 | 70.505 | 2012 | 70.442 | 2011 | 70.381 | 2010 | 70.323 | 2009 | 70.012 | 2008 | 70.164 | 2007 | 70.048 | 2006 | 69.894 | 2005 | 69.768 | 2004 | 69.67 | 2003 | 69.495 | 2002 | 69.335 | 2001 | 69.127 | 2000 | 68.978 | 1999 | 68.809 | 1998 | 68.642 | 1997 | 68.49 | 1996 | 68.323 | 1995 | 68.17 | 1994 | 68.014 | 1993 | 67.855 | 1992 | 67.686 | 1991 | 67.518 | 1990 | 67.294 | 1989 | 67.162 | 1988 | 67.026 | 1987 | 66.884 | 1986 | 66.752 | 1985 | 66.626 | 1984 | 66.482 | 1983 | 66.369 | 1982 | 66.072 | 1981 | 66.132 | 1980 | 65.961 | 1979 | 65.782 | 1978 | 65.578 | 1977 | 65.302 | 1976 | 65.127 | 1975 | 64.844 | 1974 | 64.595 | 1973 | 64.242 | 1972 | 63.983 | 1971 | 63.661 | 1970 | 63.232 | 1969 | 62.737 | 1968 | 62.185 | 1967 | 61.66 | 1966 | 61.132 | 1965 | 60.58 | 1964 | 60.054 | 1963 | 59.551 | 1962 | 59.085 | 1961 | 58.589 | 1960 | 58.231 |
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