Year | Value | 2022 | 8.3692909886919 | 2021 | 2.1631973644715 | 2020 | 0.49736731885357 | 2019 | 1.7841509740384 | 2018 | 1.9535353012703 | 2017 | 1.7944990466559 | 2016 | 0.98426924457799 | 2015 | 0.046784744983281 | 2014 | 0.17963849411464 | 2013 | 0.044292970148586 | 2012 | 0.88837750692364 | 2011 | 2.9611507382214 | 2010 | 1.1579880271563 | 2009 | 0.49446054437799 | 2008 | 3.4370491060287 | 2007 | 2.2121688343674 | 2006 | 1.3602146862768 | 2005 | 0.45317085257618 | 2004 | 0.37365982872181 | 2003 | 1.9256553489239 | 2002 | 2.1584821358926 | 2001 | 2.4059583414544 | 2000 | 0.89914373404163 | 1999 | 0.46217575633917 | 1998 | 0.26713266835501 | 1997 | 0.65841025624351 | 1996 | 0.5331319787663 | 1995 | 2.4551485781839 | 1994 | 2.1581380072463 | 1993 | 4.7281730462605 | 1992 | 2.3743672511188 | 1991 | 9.4446273294419 | 1990 | 10.366553387949 | 1989 | 6.4432758742661 | 1988 | 5.8248986843944 | 1987 | 4.1885715177137 | 1986 | 4.2359101108979 | 1985 | 7.3725745812625 | 1984 | 8.0442423899442 | 1983 | 8.8730215236321 | 1982 | 8.5891850904712 | 1981 | 12.10393853026 | 1980 | 13.7063223649 | 1979 | 7.2097861704781 | 1978 | 9.9952654171773 | 1977 | 11.441805109108 | 1976 | 10.249224652978 | 1975 | 9.7798739882258 | 1974 | 9.9117253011324 | 1973 | 6.7179973981935 | 1972 | 6.0073896986249 | 1971 | 7.3955411383764 | 1970 | 7.0163588510076 | 1969 | 2.691994585557 | 1968 | 1.9431258247324 | 1967 | 4.2893192299332 | 1966 | 6.4048082534841 | 1965 | 5.0127712964384 | 1964 | 3.3876623108835 | 1963 | 2.8717403448577 | 1962 | 4.7661972190582 | 1961 | 2.1579731098196 | 1960 | 4.1417791509021 |
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