Year | Value | 2021 | 34.637104332398 | 2020 | 35.011270387246 | 2019 | 35.43128056026 | 2018 | 35.761860898268 | 2017 | 36.105579789721 | 2016 | 36.48883227827 | 2015 | 36.930286613819 | 2014 | 37.370726577986 | 2013 | 37.831250066749 | 2012 | 38.340282718348 | 2011 | 38.868058474389 | 2010 | 39.270771295328 | 2009 | 39.637776437226 | 2008 | 40.028631488501 | 2007 | 40.192981622215 | 2006 | 40.434658992907 | 2005 | 40.627362866775 | 2004 | 40.759579264784 | 2003 | 40.960773931175 | 2002 | 41.209654249505 | 2001 | 41.443655841513 | 2000 | 41.604028580758 | 1999 | 41.812432834619 | 1998 | 41.892829212239 | 1997 | 42.235408066672 | 1996 | 42.680793952777 | 1995 | 42.986613842802 | 1994 | 43.099756950091 | 1993 | 43.449486316784 | 1992 | 43.731491341984 | 1991 | 44.097586318094 | 1990 | 44.411851654878 | 1989 | 44.862297039837 | 1988 | 45.205790813056 | 1987 | 45.639228024256 | 1986 | 45.934251157048 | 1985 | 46.171981056804 | 1984 | 46.368657174439 | 1983 | 46.532634983619 | 1982 | 46.604698929191 | 1981 | 46.758218982991 | 1980 | 46.92347677197 | 1979 | 47.070845963685 | 1978 | 47.135740008771 | 1977 | 47.180403970924 | 1976 | 47.23455361705 | 1975 | 47.345723501895 | 1974 | 47.381557354421 | 1973 | 47.393239299574 | 1972 | 47.518240537904 | 1971 | 47.602785713797 | 1970 | 47.566096731753 | 1969 | 47.593274477552 | 1968 | 47.579287723752 | 1967 | 47.580589303202 | 1966 | 47.591463765431 | 1965 | 47.584069970497 | 1964 | 47.589214974713 | 1963 | 47.591709758361 | 1962 | 47.568581034518 | 1961 | 47.483966007676 | 1960 | 47.390299271863 |
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