Year | Value | 2021 | 70.449 | 2020 | 70.299 | 2019 | 69.877 | 2018 | 69.795 | 2017 | 69.71 | 2016 | 69.65 | 2015 | 69.513 | 2014 | 69.465 | 2013 | 69.534 | 2012 | 69.497 | 2011 | 69.551 | 2010 | 69.617 | 2009 | 69.653 | 2008 | 69.602 | 2007 | 69.544 | 2006 | 69.462 | 2005 | 69.39 | 2004 | 69.313 | 2003 | 69.276 | 2002 | 69.196 | 2001 | 69.037 | 2000 | 68.966 | 1999 | 68.237 | 1998 | 68.763 | 1997 | 68.708 | 1996 | 68.63 | 1995 | 67.885 | 1994 | 67.739 | 1993 | 67.528 | 1992 | 67.353 | 1991 | 67.203 | 1990 | 66.675 | 1989 | 66.134 | 1988 | 66.04 | 1987 | 64.578 | 1986 | 65.053 | 1985 | 64.231 | 1984 | 63.912 | 1983 | 63.239 | 1982 | 62.536 | 1981 | 61.824 | 1980 | 61.083 | 1979 | 60.446 | 1978 | 59.847 | 1977 | 59.223 | 1976 | 58.659 | 1975 | 58.087 | 1974 | 57.515 | 1973 | 56.95 | 1972 | 56.271 | 1971 | 55.766 | 1970 | 55.186 | 1969 | 54.591 | 1968 | 54.038 | 1967 | 53.444 | 1966 | 52.862 | 1965 | 52.294 | 1964 | 51.706 | 1963 | 51.228 | 1962 | 50.676 | 1961 | 50.15 | 1960 | 49.63 |
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