Year | Value | 2022 | 32.033257606019 | 2021 | 32.772015061288 | 2020 | 33.532511471958 | 2019 | 34.312461040251 | 2018 | 35.115774597938 | 2017 | 35.93770976105 | 2016 | 36.772436726944 | 2015 | 37.616207649137 | 2014 | 38.46472197881 | 2013 | 39.316912513728 | 2012 | 40.171450702727 | 2011 | 41.028720502131 | 2010 | 41.912867311113 | 2009 | 42.854635908121 | 2008 | 43.799446987142 | 2007 | 44.743720142383 | 2006 | 45.678595535764 | 2005 | 46.62451652283 | 2004 | 47.592288122589 | 2003 | 48.556624227335 | 2002 | 49.51031525942 | 2001 | 50.450142719268 | 2000 | 51.327204603729 | 1999 | 52.135265401848 | 1998 | 52.92378455813 | 1997 | 53.701074785376 | 1996 | 54.463548262355 | 1995 | 55.216558915014 | 1994 | 55.962712909613 | 1993 | 56.700594972882 | 1992 | 57.425484828255 | 1991 | 58.135465414924 | 1990 | 58.831605440481 | 1989 | 59.485919667182 | 1988 | 60.134893920817 | 1987 | 60.799511947096 | 1986 | 61.464583829169 | 1985 | 62.135790870572 | 1984 | 62.816934549735 | 1983 | 63.500660463198 | 1982 | 64.160600543045 | 1981 | 64.895504630789 | 1980 | 65.626331815137 | 1979 | 66.336304159291 | 1978 | 67.044773478764 | 1977 | 67.581404929636 | 1976 | 67.939211148053 | 1975 | 68.282666492137 | 1974 | 68.636331700372 | 1973 | 68.970799395426 | 1972 | 69.232000059739 | 1971 | 69.421707916315 | 1970 | 69.583004211093 | 1969 | 69.73246616067 | 1968 | 69.887640321502 | 1967 | 70.057249586109 | 1966 | 70.23375464185 | 1965 | 70.380886798828 | 1964 | 70.547158625467 | 1963 | 71.134265215907 | 1962 | 71.70754486462 | 1961 | 72.371286763691 | 1960 | 73.133078089821 |
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