Year | Value | 2022 | 7.6965669988926 | 2021 | 1.8530454398968 | 2020 | 0.42071197411012 | 2019 | 0.75813157251162 | 2018 | 0.81360946745563 | 2017 | 1.147132169576 | 2016 | 0.25000000000003 | 2015 | 0.45203415369158 | 2014 | 0.56402054044954 | 2013 | 0.78907178007806 | 2012 | 2.3979148566464 | 2011 | 2.7586822605125 | 2010 | 2.3109243697479 | 2009 | 1.3047099102434 | 2008 | 3.4162679425837 | 2007 | 1.6932658622032 | 2006 | 1.9242213846459 | 2005 | 1.8178145829125 | 2004 | 1.1543569312493 | 2003 | 2.0750782064651 | 2002 | 2.424436612197 | 2001 | 2.3378700025526 | 2000 | 2.9032820323645 | 1999 | 2.4977954440453 | 1998 | 1.8456512200789 | 1997 | 2.1821667790712 | 1996 | 2.1262980227558 | 1995 | 2.0836084238285 | 1994 | 1.9920146380953 | 1993 | 1.2578566795326 | 1992 | 2.0960444293322 | 1991 | 2.3951533172442 | 1990 | 2.64160306382 | 1989 | 4.7727234243552 | 1988 | 4.5351330101572 | 1987 | 4.0199934568316 | 1986 | 3.6781841186345 | 1985 | 4.6787514518325 | 1984 | 6.2907793602377 | 1983 | 6.9082288115884 | 1982 | 10.120825677982 | 1981 | 11.767387434418 | 1980 | 12.305324076018 | 1979 | 9.6110503790712 | 1978 | 10.213654571041 | 1977 | 10.922237810033 | 1976 | 9.0102908356222 | 1975 | 9.6056120753868 | 1974 | 15.27520622184 | 1973 | 9.3033829797367 | 1972 | 6.5623609025654 | 1971 | 5.8698695907191 | 1970 | 6.5148414165298 | 1969 | 3.4879192439519 | 1968 | 8.0052071036647 | 1967 | 8.2078535584401 | 1966 | 7.0649596965881 | 1965 | 5.4499999992505 | 1964 | 3.0927835051545 | 1963 | 6.1050328230293 | 1962 | 7.3778195481846 | 1961 | 3.4516285855783 | 1960 | 1.2552301255292 |
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