Year | Value | 2021 | 67.12 | 2020 | 67.106 | 2019 | 67.581 | 2018 | 67.92 | 2017 | 68.17 | 2016 | 68.395 | 2015 | 68.234 | 2014 | 68.37 | 2013 | 68.405 | 2012 | 68.307 | 2011 | 68.266 | 2010 | 68.214 | 2009 | 68.139 | 2008 | 68.205 | 2007 | 68.316 | 2006 | 68.394 | 2005 | 68.063 | 2004 | 68.06 | 2003 | 67.956 | 2002 | 66.956 | 2001 | 67.658 | 2000 | 66.921 | 1999 | 66.801 | 1998 | 66.522 | 1997 | 66.252 | 1996 | 65.835 | 1995 | 65.522 | 1994 | 65.016 | 1993 | 64.954 | 1992 | 64.584 | 1991 | 64.501 | 1990 | 64.305 | 1989 | 63.896 | 1988 | 63.669 | 1987 | 63.157 | 1986 | 62.992 | 1985 | 62.807 | 1984 | 62.495 | 1983 | 62.097 | 1982 | 61.473 | 1981 | 61.241 | 1980 | 60.915 | 1979 | 60.478 | 1978 | 60.502 | 1977 | 60.212 | 1976 | 60.095 | 1975 | 59.907 | 1974 | 59.71 | 1973 | 59.502 | 1972 | 59.283 | 1971 | 58.985 | 1970 | 58.581 | 1969 | 58.382 | 1968 | 57.995 | 1967 | 57.569 | 1966 | 57.141 | 1965 | 56.926 | 1964 | 56.441 | 1963 | 55.978 | 1962 | 55.776 | 1961 | 55.103 | 1960 | 54.42 |
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