Year | Value | 2022 | 1.3016402514128 | 2021 | 1.2856299206557 | 2020 | 1.4862215157563 | 2019 | 1.8230161189065 | 2018 | 1.9486344538644 | 2017 | 1.9892678402512 | 2016 | 2.0468711710578 | 2015 | 2.1163206340184 | 2014 | 2.1942767523837 | 2013 | 2.238167082343 | 2012 | 2.2566315667744 | 2011 | 2.2810989625884 | 2010 | 2.4943260256634 | 2009 | 2.7428063511482 | 2008 | 2.8194899348079 | 2007 | 2.88259288843 | 2006 | 2.9360539078147 | 2005 | 2.9855449000999 | 2004 | 3.0331016479329 | 2003 | 3.0814865419893 | 2002 | 3.1294771242396 | 2001 | 3.1502729945496 | 2000 | 3.2437287004827 | 1999 | 3.4204890322113 | 1998 | 3.5250604678139 | 1997 | 3.4091043188561 | 1996 | 3.0404184257032 | 1995 | 2.5575314541169 | 1994 | 2.1595722520625 | 1993 | 2.0173594812241 | 1992 | 2.0369054455421 | 1991 | 2.0989739589677 | 1990 | 2.1557283463019 | 1989 | 2.1940729422287 | 1988 | 2.219312189906 | 1987 | 2.2409719147448 | 1986 | 2.2715395053782 | 1985 | 2.2992933264763 | 1984 | 2.3232849992599 | 1983 | 2.3627996512524 | 1982 | 2.4206538982961 | 1981 | 2.4710594252941 | 1980 | 2.3070762163998 | 1979 | 2.0587998691147 | 1978 | 1.9992233057135 | 1977 | 2.0115343700424 | 1976 | 2.0207141524552 | 1975 | 1.6814763547095 | 1974 | 1.3659970910665 | 1973 | 1.4456705778885 | 1972 | 1.5821724791152 | 1971 | 1.7918805967454 | 1970 | 2.3092429607029 | 1969 | 2.8503453439674 | 1968 | 3.0183164325965 | 1967 | 3.0520929405083 | 1966 | 3.0288834895853 | 1965 | 2.9681284417393 | 1964 | 2.9010078864214 | 1963 | 2.7420328537125 | 1962 | 2.5598281036454 | 1961 | 2.5428028051209 |
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