Year | Value | 2021 | 29.010494566064 | 2020 | 29.024269990332 | 2019 | 29.090460217267 | 2018 | 29.115268694295 | 2017 | 29.166343030695 | 2016 | 29.180963443696 | 2015 | 29.217746561444 | 2014 | 29.253808412286 | 2013 | 29.309540607164 | 2012 | 29.332688655819 | 2011 | 29.366969323947 | 2010 | 29.453504089346 | 2009 | 29.291963465894 | 2008 | 29.374469069224 | 2007 | 29.38801929222 | 2006 | 29.545127299559 | 2005 | 29.586901241958 | 2004 | 29.632712920598 | 2003 | 29.704667647516 | 2002 | 29.832937658398 | 2001 | 29.969709563584 | 2000 | 30.078445491696 | 1999 | 30.118491800341 | 1998 | 30.163523004646 | 1997 | 30.220094916911 | 1996 | 30.246549241194 | 1995 | 30.328449429505 | 1994 | 30.607607352699 | 1993 | 30.652295741122 | 1992 | 30.675946223942 | 1991 | 43.001989292497 | 1990 | 43.334689418164 | 1989 | 43.50584181947 | 1988 | 43.490796219139 | 1987 | 43.618591837036 | 1986 | 43.483932701933 | 1985 | 43.493463505269 | 1984 | 43.475736220268 | 1983 | 43.352855374612 | 1982 | 43.654039567031 | 1981 | 43.962557544683 | 1980 | 44.041840994828 | 1979 | 44.185389620853 | 1978 | 44.110963845628 | 1977 | 44.118678823064 | 1976 | 44.140057736638 | 1975 | 44.255355113479 | 1974 | 44.438535499245 | 1973 | 44.62298742879 | 1972 | 44.772939325454 | 1971 | 44.81895351121 | 1970 | 45.181458516445 | 1969 | 45.672648251904 | 1968 | 45.496580345062 | 1967 | 45.604465062302 | 1966 | 45.67415953186 | 1965 | 45.709730974124 | 1964 | 45.850497260545 | 1963 | 45.992897114264 | 1962 | 45.964803718277 | 1961 | 45.980101589928 |
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