Year | Value | 2021 | 67.591 | 2020 | 67.785 | 2019 | 68.523 | 2018 | 68.355 | 2017 | 68.267 | 2016 | 67.492 | 2015 | 67.249 | 2014 | 66.845 | 2013 | 66.328 | 2012 | 65.746 | 2011 | 64.902 | 2010 | 65.249 | 2009 | 65.116 | 2008 | 65.079 | 2007 | 64.724 | 2006 | 64.398 | 2005 | 63.709 | 2004 | 63.731 | 2003 | 63.166 | 2002 | 62.6 | 2001 | 62.032 | 2000 | 61.655 | 1999 | 61.393 | 1998 | 61.187 | 1997 | 61.181 | 1996 | 61.097 | 1995 | 61.056 | 1994 | 61.069 | 1993 | 61.138 | 1992 | 61.284 | 1991 | 61.429 | 1990 | 61.471 | 1989 | 60.158 | 1988 | 61.334 | 1987 | 61.017 | 1986 | 57.527 | 1985 | 59.811 | 1984 | 59.487 | 1983 | 59.432 | 1982 | 59.558 | 1981 | 59.487 | 1980 | 59.739 | 1979 | 59.714 | 1978 | 59.325 | 1977 | 58.83 | 1976 | 58.576 | 1975 | 58.263 | 1974 | 58.042 | 1973 | 57.941 | 1972 | 57.349 | 1971 | 56.841 | 1970 | 56.516 | 1969 | 55.08 | 1968 | 54.916 | 1967 | 54.066 | 1966 | 51.56 | 1965 | 49.022 | 1964 | 47.161 | 1963 | 46.094 | 1962 | 45.861 | 1961 | 44.359 | 1960 | 43.04 |
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