Year | Value | 2021 | 67.2 | 2020 | 66.882 | 2019 | 66.608 | 2018 | 66.355 | 2017 | 66.121 | 2016 | 65.906 | 2015 | 65.705 | 2014 | 65.493 | 2013 | 65.36 | 2012 | 65.271 | 2011 | 65.178 | 2010 | 65.119 | 2009 | 65.112 | 2008 | 65.124 | 2007 | 65.29 | 2006 | 65.49 | 2005 | 65.761 | 2004 | 66.076 | 2003 | 66.257 | 2002 | 66.257 | 2001 | 66.138 | 2000 | 65.72 | 1999 | 65.923 | 1998 | 65.718 | 1997 | 65.517 | 1996 | 65.37 | 1995 | 65.183 | 1994 | 65.064 | 1993 | 65.087 | 1992 | 65.242 | 1991 | 65.383 | 1990 | 65.477 | 1989 | 65.671 | 1988 | 65.858 | 1987 | 65.952 | 1986 | 66.061 | 1985 | 66.106 | 1984 | 66.053 | 1983 | 65.93 | 1982 | 65.77 | 1981 | 65.611 | 1980 | 65.421 | 1979 | 65.23 | 1978 | 65.074 | 1977 | 64.927 | 1976 | 64.755 | 1975 | 64.503 | 1974 | 64.245 | 1973 | 63.97 | 1972 | 63.585 | 1971 | 63.217 | 1970 | 62.762 | 1969 | 62.296 | 1968 | 61.825 | 1967 | 61.286 | 1966 | 60.762 | 1965 | 60.234 | 1964 | 59.658 | 1963 | 59.059 | 1962 | 58.431 | 1961 | 57.736 | 1960 | 57.1 |
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