Year | Value | 2022 | 1.0363329824318 | 2021 | 1.2907830287353 | 2020 | 1.3629180410497 | 2019 | 1.3899285802391 | 2018 | 1.4373941406407 | 2017 | 1.4773906610139 | 2016 | 1.507492930927 | 2015 | 1.5463490054768 | 2014 | 1.5899845028683 | 2013 | 1.5979080422695 | 2012 | 1.600225242912 | 2011 | 1.6428489562165 | 2010 | 1.6469008266339 | 2009 | 1.6136025693421 | 2008 | 1.6205548971186 | 2007 | 1.6570554769213 | 2006 | 1.6836085150103 | 2005 | 1.7321132736475 | 2004 | 1.7812014163556 | 2003 | 1.7863052290197 | 2002 | 1.8368276989536 | 2001 | 1.9145434637718 | 2000 | 1.9250896673008 | 1999 | 1.9251983754584 | 1998 | 1.9586377583315 | 1997 | 1.9751017103223 | 1996 | 2.0027719045754 | 1995 | 2.0523675105788 | 1994 | 2.0771386150126 | 1993 | 2.1097042584234 | 1992 | 2.1882738428264 | 1991 | 2.3057089042586 | 1990 | 2.354225563518 | 1989 | 2.353264747054 | 1988 | 2.3837564705076 | 1987 | 2.4218650383231 | 1986 | 2.4585317255058 | 1985 | 2.4689805290676 | 1984 | 2.4742236318999 | 1983 | 2.5010906416165 | 1982 | 2.5768794134343 | 1981 | 2.6151145280581 | 1980 | 2.5200247866004 | 1979 | 2.3992546602592 | 1978 | 2.3701633371397 | 1977 | 2.394242517201 | 1976 | 2.374971776417 | 1975 | 2.3615713447387 | 1974 | 2.3656264577464 | 1973 | 2.362301998368 | 1972 | 2.2736985555615 | 1971 | 2.2448892145944 | 1970 | 2.32115536149 | 1969 | 2.3484333238386 | 1968 | 2.3402746072539 | 1967 | 2.3244674306269 | 1966 | 2.3341966967929 | 1965 | 2.377782660943 | 1964 | 2.413504086243 | 1963 | 2.4156784922019 | 1962 | 2.4044497060223 | 1961 | 2.4053413079027 |
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