Year | Value | 2022 | 35.816253388624 | 2021 | 35.263213497479 | 2020 | 34.718536936571 | 2019 | 34.177757748557 | 2018 | 33.638093408292 | 2017 | 33.097768898927 | 2016 | 32.55753097 | 2015 | 32.022695858205 | 2014 | 31.496958846358 | 2013 | 30.98037313097 | 2012 | 30.473740360521 | 2011 | 29.973977616533 | 2010 | 29.464884334808 | 2009 | 28.962178019247 | 2008 | 28.467002471348 | 2007 | 27.975788841742 | 2006 | 27.573295197822 | 2005 | 27.128825151301 | 2004 | 26.679329771958 | 2003 | 26.247852005255 | 2002 | 25.82053795987 | 2001 | 25.400926396771 | 2000 | 25.003055638381 | 1999 | 24.659058104027 | 1998 | 24.322332185305 | 1997 | 23.984639257439 | 1996 | 23.659916070057 | 1995 | 23.355897446225 | 1994 | 23.005299738949 | 1993 | 22.627702465763 | 1992 | 22.255630180574 | 1991 | 21.888495568769 | 1990 | 21.502401718845 | 1989 | 21.071306658511 | 1988 | 20.6294489971 | 1987 | 20.165224396552 | 1986 | 19.701169707519 | 1985 | 19.238715757362 | 1984 | 18.782267396779 | 1983 | 18.351473396761 | 1982 | 17.967758607673 | 1981 | 17.625627065565 | 1980 | 17.124084284456 | 1979 | 16.547284598099 | 1978 | 16.040911796123 | 1977 | 15.529170983288 | 1976 | 15.039268969131 | 1975 | 14.561802257243 | 1974 | 14.607395851047 | 1973 | 14.172232806292 | 1972 | 13.737226999444 | 1971 | 13.289878743166 | 1970 | 12.866355497956 | 1969 | 12.486486653541 | 1968 | 12.105669545942 | 1967 | 11.740283605604 | 1966 | 11.388067069005 | 1965 | 11.068483282829 | 1964 | 10.761001361216 | 1963 | 10.465087135726 | 1962 | 10.18330340836 | 1961 | 9.9166798919363 | 1960 | 9.6714875847323 |
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