Year | Value | 2021 | 34.635605406947 | 2020 | 35.009627395249 | 2019 | 35.429623986465 | 2018 | 35.760207884338 | 2017 | 36.103876629119 | 2016 | 36.487088068524 | 2015 | 36.928440802714 | 2014 | 37.368830463182 | 2013 | 37.82932589456 | 2012 | 38.338407035102 | 2011 | 38.866098622264 | 2010 | 39.268478493491 | 2009 | 39.635579642944 | 2008 | 40.026310069244 | 2007 | 40.190609889725 | 2006 | 40.43217559319 | 2005 | 40.624972410412 | 2004 | 40.756998607691 | 2003 | 40.958170084646 | 2002 | 41.206872962197 | 2001 | 41.440858193946 | 2000 | 41.601248030811 | 1999 | 41.80952914242 | 1998 | 41.889860375121 | 1997 | 42.2325278437 | 1996 | 42.678068940363 | 1995 | 42.98380440607 | 1994 | 43.09714601424 | 1993 | 43.446896757373 | 1992 | 43.728747115968 | 1991 | 44.09494542632 | 1990 | 44.408984373134 | 1989 | 44.859287889383 | 1988 | 45.202779641175 | 1987 | 45.636181175384 | 1986 | 45.931445362219 | 1985 | 46.169120971707 | 1984 | 46.365769120154 | 1983 | 46.529491716312 | 1982 | 46.601183993051 | 1981 | 46.755233981387 | 1980 | 46.920544152827 | 1979 | 47.067615079236 | 1978 | 47.132649231366 | 1977 | 47.176713152501 | 1976 | 47.231037432575 | 1975 | 47.342758184115 | 1974 | 47.37885366825 | 1973 | 47.389917718382 | 1972 | 47.515218545318 | 1971 | 47.600248328656 | 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 | 47.483966007675 | 1960 | 47.390299271863 |
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