Year | Value | 2021 | 68.397 | 2020 | 68.547 | 2019 | 67.801 | 2018 | 67.75 | 2017 | 67.645 | 2016 | 67.652 | 2015 | 67.551 | 2014 | 67.499 | 2013 | 67.49 | 2012 | 67.472 | 2011 | 67.508 | 2010 | 67.599 | 2009 | 67.623 | 2008 | 67.566 | 2007 | 67.505 | 2006 | 67.427 | 2005 | 67.343 | 2004 | 67.257 | 2003 | 67.214 | 2002 | 67.159 | 2001 | 66.962 | 2000 | 66.865 | 1999 | 66.275 | 1998 | 66.653 | 1997 | 66.61 | 1996 | 66.535 | 1995 | 65.6 | 1994 | 65.418 | 1993 | 65.219 | 1992 | 64.981 | 1991 | 64.86 | 1990 | 64.063 | 1989 | 63.679 | 1988 | 63.603 | 1987 | 62.338 | 1986 | 62.642 | 1985 | 61.946 | 1984 | 61.515 | 1983 | 61.04 | 1982 | 60.507 | 1981 | 60.031 | 1980 | 59.495 | 1979 | 58.85 | 1978 | 58.446 | 1977 | 57.907 | 1976 | 57.381 | 1975 | 56.88 | 1974 | 56.355 | 1973 | 55.854 | 1972 | 55.239 | 1971 | 54.736 | 1970 | 54.18 | 1969 | 53.606 | 1968 | 53.075 | 1967 | 52.52 | 1966 | 51.991 | 1965 | 51.472 | 1964 | 50.926 | 1963 | 50.588 | 1962 | 50.076 | 1961 | 49.564 | 1960 | 49.064 |
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