Year | Value | 2022 | 36.243369056662 | 2021 | 35.702185584441 | 2020 | 35.177203859103 | 2019 | 34.653164163095 | 2018 | 34.130373436522 | 2017 | 33.615860346736 | 2016 | 33.107455992979 | 2015 | 32.609706950411 | 2014 | 32.133278313107 | 2013 | 31.71525004046 | 2012 | 31.308044324098 | 2011 | 30.89031466027 | 2010 | 30.453626907675 | 2009 | 29.985848651202 | 2008 | 29.528385225356 | 2007 | 29.061733611678 | 2006 | 28.658892939653 | 2005 | 28.229785758654 | 2004 | 27.815417810621 | 2003 | 27.417416045106 | 2002 | 27.024022637119 | 2001 | 26.636521380463 | 2000 | 26.267249532225 | 1999 | 25.946281044472 | 1998 | 25.635148994439 | 1997 | 25.322943629142 | 1996 | 25.022129566713 | 1995 | 24.740023054698 | 1994 | 24.417028930956 | 1993 | 24.081475593104 | 1992 | 23.752154871354 | 1991 | 23.423835627917 | 1990 | 23.074251154856 | 1989 | 22.683905966763 | 1988 | 22.280653030744 | 1987 | 21.857073916648 | 1986 | 21.435132863146 | 1985 | 21.014824581535 | 1984 | 20.600157453825 | 1983 | 20.214528660604 | 1982 | 19.87244078575 | 1981 | 19.563537109727 | 1980 | 19.102645544101 | 1979 | 18.574496122782 | 1978 | 18.111750436027 | 1977 | 17.619783379403 | 1976 | 17.144092264765 | 1975 | 16.678337583835 | 1974 | 16.685004600841 | 1973 | 16.267867413238 | 1972 | 15.850364055018 | 1971 | 15.416821463351 | 1970 | 14.99700210474 | 1969 | 14.603815741502 | 1968 | 14.205603534876 | 1967 | 13.822015769714 | 1966 | 13.450494855542 | 1965 | 13.108141748674 | 1964 | 12.766176048011 | 1963 | 12.435214158729 | 1962 | 12.118035153368 | 1961 | 11.816650685114 | 1960 | 11.533374532023 |
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