Year | Value | 2021 | 70.343035674435 | 2020 | 70.34144164249 | 2019 | 70.339847610546 | 2018 | 70.338253578602 | 2017 | 70.338253578602 | 2016 | 70.338253578602 | 2015 | 70.338253578602 | 2014 | 70.338253578602 | 2013 | 70.338253578602 | 2012 | 70.178850384162 | 2011 | 70.178850384162 | 2010 | 70.338253578602 | 2009 | 70.338253578602 | 2008 | 70.338253578602 | 2007 | 70.178850384162 | 2006 | 70.258551981382 | 2005 | 70.338253578602 | 2004 | 70.387668568878 | 2003 | 70.311155035547 | 2002 | 70.280868428603 | 2001 | 70.25058182166 | 2000 | 70.244205693882 | 1999 | 70.244205693882 | 1998 | 70.244205693882 | 1997 | 70.242611661938 | 1996 | 70.234641502216 | 1995 | 70.226671342494 | 1994 | 70.217107150827 | 1993 | 70.207542959161 | 1992 | 70.205948927216 | 1991 | 70.204354895272 | 1990 | 70.204354895272 | 1989 | 70.201166831383 | 1988 | 70.199572799439 | 1987 | 70.193196671661 | 1986 | 70.185226511939 | 1985 | 70.177256352217 | 1984 | 70.169286192495 | 1983 | 70.161316032773 | 1982 | 70.153345873051 | 1981 | 70.145375713329 | 1980 | 70.137405553607 | 1979 | 70.129435393885 | 1978 | 70.121465234163 | 1977 | 70.113495074441 | 1976 | 70.105524914719 | 1975 | 70.097554754997 | 1974 | 70.089584595275 | 1973 | 70.081614435553 | 1972 | 70.073644275831 | 1971 | 70.065674116109 | 1970 | 70.057703956387 | 1969 | 70.049733796665 | 1968 | 70.041763636943 | 1967 | 70.033793477221 | 1966 | 70.025823317499 | 1965 | 70.017853157777 | 1964 | 70.009882998055 | 1963 | 70.001912838333 | 1962 | 69.993942678611 | 1961 | 69.985972518889 |
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