Year | Value | 2022 | 1.1902748132628 | 2021 | 1.1934867186788 | 2020 | 1.3397392204311 | 2019 | 1.4575043914178 | 2018 | 1.4874741967244 | 2017 | 1.5201088810583 | 2016 | 1.5472882963471 | 2015 | 1.5731449401483 | 2014 | 1.6033151067222 | 2013 | 1.629573199155 | 2012 | 1.6546353988749 | 2011 | 1.6778284986513 | 2010 | 1.6962823764467 | 2009 | 1.7131140494039 | 2008 | 1.7297614358827 | 2007 | 1.7502328873761 | 2006 | 1.7471327548118 | 2005 | 1.7329882488039 | 2004 | 1.7391702736837 | 2003 | 1.7462893985294 | 2002 | 1.7510722875487 | 2001 | 1.7698172390087 | 2000 | 1.8037904920734 | 1999 | 1.819064650219 | 1998 | 1.8181702438498 | 1997 | 1.8386098473921 | 1996 | 1.8685088296267 | 1995 | 1.9021772687113 | 1994 | 1.9587308671643 | 1993 | 2.009183647754 | 1992 | 2.0428995676245 | 1991 | 2.0737946821272 | 1990 | 2.0940816969428 | 1989 | 2.1096510522039 | 1988 | 2.1186479797611 | 1987 | 2.1156305889271 | 1986 | 2.1128317429371 | 1985 | 2.1160577095186 | 1984 | 2.1226177694219 | 1983 | 2.1385359463747 | 1982 | 2.1618326749641 | 1981 | 2.1882267487991 | 1980 | 2.2158991455174 | 1979 | 2.2394999953242 | 1978 | 2.2528961700257 | 1977 | 2.2542231747392 | 1976 | 2.2480223108081 | 1975 | 2.2484907046748 | 1974 | 2.2493254448799 | 1973 | 2.2369624683957 | 1972 | 2.2261246159706 | 1971 | 2.2121765252477 | 1970 | 2.1957957723624 | 1969 | 2.1825139763912 | 1968 | 2.1643957396578 | 1967 | 2.1462270080773 | 1966 | 2.1288908111202 | 1965 | 2.1127656243908 | 1964 | 2.1001621904707 | 1963 | 2.0894580522661 | 1962 | 2.0760898378842 | 1961 | 2.0616408324362 |
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