Year | Value | 2021 | 70.221 | 2020 | 70.99 | 2019 | 71.358 | 2018 | 71.367 | 2017 | 71.302 | 2016 | 70.844 | 2015 | 70.483 | 2014 | 70.415 | 2013 | 70.052 | 2012 | 70.085 | 2011 | 69.88 | 2010 | 69.664 | 2009 | 69.48 | 2008 | 69.319 | 2007 | 69.128 | 2006 | 68.977 | 2005 | 68.779 | 2004 | 68.613 | 2003 | 68.402 | 2002 | 68.564 | 2001 | 68.308 | 2000 | 68.007 | 1999 | 67.737 | 1998 | 67.471 | 1997 | 67.197 | 1996 | 66.742 | 1995 | 66.312 | 1994 | 65.816 | 1993 | 65.468 | 1992 | 65.031 | 1991 | 64.755 | 1990 | 64.146 | 1989 | 63.628 | 1988 | 62.98 | 1987 | 62.137 | 1986 | 61.261 | 1985 | 60.542 | 1984 | 59.73 | 1983 | 58.888 | 1982 | 57.948 | 1981 | 57.138 | 1980 | 56.628 | 1979 | 55.802 | 1978 | 54.99 | 1977 | 54.134 | 1976 | 53.365 | 1975 | 52.591 | 1974 | 51.838 | 1973 | 50.852 | 1972 | 50.765 | 1971 | 50.386 | 1970 | 50.013 | 1969 | 49.797 | 1968 | 49.897 | 1967 | 49.538 | 1966 | 49.504 | 1965 | 49.128 | 1964 | 48.47 | 1963 | 47.672 | 1962 | 46.843 | 1961 | 46.024 | 1960 | 45.373 |
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