Year | Value | 2022 | 39.925325098515 | 2021 | 40.285781751387 | 2020 | 40.525374620147 | 2019 | 40.801955273776 | 2018 | 41.17761851531 | 2017 | 41.574251770309 | 2016 | 42.058062185068 | 2015 | 42.61070870709 | 2014 | 43.1970115723 | 2013 | 43.767183187967 | 2012 | 44.275987547643 | 2011 | 44.764329951411 | 2010 | 45.258717461112 | 2009 | 45.80982835249 | 2008 | 46.481209704537 | 2007 | 47.227538625662 | 2006 | 47.981749884421 | 2005 | 48.626184356375 | 2004 | 49.149045526862 | 2003 | 49.597802495116 | 2002 | 50.034176368978 | 2001 | 50.456906763526 | 2000 | 50.885212706097 | 1999 | 51.322418631101 | 1998 | 51.749268936666 | 1997 | 52.157175322899 | 1996 | 52.552036339965 | 1995 | 52.930162341312 | 1994 | 53.299931251647 | 1993 | 53.653794167501 | 1992 | 53.984631105811 | 1991 | 54.359048575256 | 1990 | 54.937265668847 | 1989 | 55.534878255949 | 1988 | 56.116412099117 | 1987 | 56.707878853461 | 1986 | 57.277298292314 | 1985 | 57.785069854199 | 1984 | 58.25709828478 | 1983 | 58.700980681754 | 1982 | 59.11717142983 | 1981 | 59.603372415096 | 1980 | 60.070637716587 | 1979 | 60.601951628046 | 1978 | 61.106733412103 | 1977 | 61.59907501416 | 1976 | 62.090404709942 | 1975 | 62.620404300631 | 1974 | 63.153544680052 | 1973 | 63.695883408286 | 1972 | 64.225143656587 | 1971 | 64.781182677123 | 1970 | 65.336154476232 | 1969 | 65.885921399019 | 1968 | 66.429208411495 | 1967 | 66.953018358331 | 1966 | 67.469617023699 | 1965 | 68.033628373052 | 1964 | 68.59495977387 | 1963 | 69.125350630566 | 1962 | 69.612625356554 | 1961 | 70.081760248229 | 1960 | 70.529372879893 |
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