Year | Value | 2021 | 70.71 | 2020 | 70.674 | 2019 | 71.077 | 2018 | 71.318 | 2017 | 71.467 | 2016 | 71.595 | 2015 | 71.408 | 2014 | 71.529 | 2013 | 71.499 | 2012 | 71.398 | 2011 | 71.318 | 2010 | 71.233 | 2009 | 71.112 | 2008 | 71.137 | 2007 | 71.06 | 2006 | 71.093 | 2005 | 70.884 | 2004 | 70.838 | 2003 | 70.76 | 2002 | 69.46 | 2001 | 70.479 | 2000 | 69.769 | 1999 | 69.706 | 1998 | 69.465 | 1997 | 69.229 | 1996 | 68.776 | 1995 | 68.553 | 1994 | 68.095 | 1993 | 68.059 | 1992 | 67.832 | 1991 | 67.619 | 1990 | 67.425 | 1989 | 67.096 | 1988 | 66.859 | 1987 | 66.292 | 1986 | 66.172 | 1985 | 65.97 | 1984 | 65.749 | 1983 | 65.282 | 1982 | 64.821 | 1981 | 64.478 | 1980 | 64.212 | 1979 | 63.78 | 1978 | 63.72 | 1977 | 63.363 | 1976 | 63.092 | 1975 | 62.802 | 1974 | 62.499 | 1973 | 62.139 | 1972 | 61.781 | 1971 | 61.518 | 1970 | 61.035 | 1969 | 60.662 | 1968 | 60.193 | 1967 | 59.873 | 1966 | 59.337 | 1965 | 59.11 | 1964 | 58.532 | 1963 | 58.176 | 1962 | 57.803 | 1961 | 57.11 | 1960 | 56.409 |
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