Year | Value | 2021 | 69.56 | 2020 | 70.7 | 2019 | 72.203 | 2018 | 71.956 | 2017 | 71.635 | 2016 | 71.092 | 2015 | 71.124 | 2014 | 71.191 | 2013 | 70.745 | 2012 | 70.287 | 2011 | 70.089 | 2010 | 69.844 | 2009 | 69.664 | 2008 | 69.378 | 2007 | 68.956 | 2006 | 68.545 | 2005 | 68.252 | 2004 | 67.537 | 2003 | 67.206 | 2002 | 66.845 | 2001 | 66.644 | 2000 | 66.262 | 1999 | 66.381 | 1998 | 66.091 | 1997 | 65.743 | 1996 | 65.376 | 1995 | 64.905 | 1994 | 64.637 | 1993 | 64.19 | 1992 | 63.799 | 1991 | 63.442 | 1990 | 63.099 | 1989 | 63.315 | 1988 | 62.929 | 1987 | 62.559 | 1986 | 62.181 | 1985 | 61.783 | 1984 | 61.389 | 1983 | 60.984 | 1982 | 60.525 | 1981 | 60.028 | 1980 | 59.494 | 1979 | 58.97 | 1978 | 58.416 | 1977 | 57.924 | 1976 | 57.489 | 1975 | 57.027 | 1974 | 56.54 | 1973 | 56.077 | 1972 | 55.641 | 1971 | 55.182 | 1970 | 54.779 | 1969 | 54.348 | 1968 | 53.883 | 1967 | 53.446 | 1966 | 53.058 | 1965 | 52.671 | 1964 | 52.265 | 1963 | 51.835 | 1962 | 51.346 | 1961 | 50.788 | 1960 | 50.281 |
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