Year | Value | 2021 | 66.259 | 2020 | 66.739 | 2019 | 68.034 | 2018 | 67.832 | 2017 | 67.935 | 2016 | 67.757 | 2015 | 69.041 | 2014 | 68.887 | 2013 | 69.297 | 2012 | 68.949 | 2011 | 68.983 | 2010 | 68.918 | 2009 | 68.523 | 2008 | 68.325 | 2007 | 69.129 | 2006 | 68.894 | 2005 | 69.138 | 2004 | 68.95 | 2003 | 68.292 | 2002 | 69.188 | 2001 | 67.526 | 2000 | 69.073 | 1999 | 69.295 | 1998 | 69.725 | 1997 | 69.994 | 1996 | 69.504 | 1995 | 69.484 | 1994 | 69.126 | 1993 | 69.314 | 1992 | 69.373 | 1991 | 69.385 | 1990 | 69.293 | 1989 | 68.906 | 1988 | 68.967 | 1987 | 68.85 | 1986 | 68.869 | 1985 | 68.404 | 1984 | 68.231 | 1983 | 67.854 | 1982 | 67.363 | 1981 | 67.096 | 1980 | 66.419 | 1979 | 66.268 | 1978 | 65.895 | 1977 | 65.618 | 1976 | 65.452 | 1975 | 64.877 | 1974 | 64.364 | 1973 | 63.776 | 1972 | 63.26 | 1971 | 62.854 | 1970 | 62.205 | 1969 | 61.276 | 1968 | 60.868 | 1967 | 60.335 | 1966 | 59.627 | 1965 | 59.141 | 1964 | 58.605 | 1963 | 58.173 | 1962 | 57.448 | 1961 | 57.463 | 1960 | 56.539 |
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