Year | Value | 2022 | 40.773685170413 | 2021 | 41.625987170337 | 2020 | 42.505073797289 | 2019 | 43.412386441269 | 2018 | 44.347988905461 | 2017 | 45.311143766869 | 2016 | 46.298772797587 | 2015 | 47.294710951758 | 2014 | 48.295437671296 | 2013 | 49.301439661231 | 2012 | 50.310098009462 | 2011 | 51.324748489898 | 2010 | 52.364500014295 | 2009 | 53.468318828394 | 2008 | 54.572051601485 | 2007 | 55.675575559258 | 2006 | 56.774040221255 | 2005 | 57.884953041474 | 2004 | 59.020425724229 | 2003 | 60.151945107455 | 2002 | 61.272741949993 | 2001 | 62.38171745802 | 2000 | 63.411371101045 | 1999 | 64.327267225546 | 1998 | 65.218340552183 | 1997 | 66.098441691009 | 1996 | 66.965956114337 | 1995 | 67.823710609603 | 1994 | 68.666108942195 | 1993 | 69.495156035383 | 1992 | 70.308874097872 | 1991 | 71.109841595266 | 1990 | 71.886258532382 | 1989 | 72.597891410405 | 1988 | 73.295255609266 | 1987 | 73.979249588026 | 1986 | 74.64990350856 | 1985 | 75.309325085433 | 1984 | 75.958320994913 | 1983 | 76.596997390398 | 1982 | 77.217559200869 | 1981 | 77.936289345646 | 1980 | 78.644561102354 | 1979 | 79.324441637354 | 1978 | 79.971007909633 | 1977 | 80.373323108046 | 1976 | 80.540976121562 | 1975 | 80.705111074513 | 1974 | 80.766976778029 | 1973 | 80.979603864498 | 1972 | 81.115805956094 | 1971 | 81.165979435084 | 1970 | 81.195680956133 | 1969 | 81.22365126192 | 1968 | 81.245987532397 | 1967 | 81.259157496699 | 1966 | 81.258120793709 | 1965 | 81.218097440285 | 1964 | 81.147924722884 | 1963 | 81.628917036097 | 1962 | 82.101492901524 | 1961 | 82.57228630164 | 1960 | 83.044618645735 |
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