Year | Value | 2022 | 0.91678267083122 | 2021 | 1.0294639300667 | 2020 | 1.1244694192961 | 2019 | 1.1444732852335 | 2018 | 1.1876518590363 | 2017 | 1.2163598964308 | 2016 | 1.2124427044994 | 2015 | 1.2265965959047 | 2014 | 1.2904435380554 | 2013 | 1.3447112725685 | 2012 | 1.4130662475401 | 2011 | 1.4664970370134 | 2010 | 1.4748435862988 | 2009 | 1.4697348220122 | 2008 | 1.463047121984 | 2007 | 1.5046833806899 | 2006 | 1.5979726675089 | 2005 | 1.6864061087915 | 2004 | 1.7688775690531 | 2003 | 1.8663902750028 | 2002 | 1.9351047500349 | 2001 | 1.9452893616825 | 2000 | 1.9618182679604 | 1999 | 1.9976729855397 | 1998 | 2.0242233276986 | 1997 | 2.0471399521558 | 1996 | 2.0842189414292 | 1995 | 2.1442107455472 | 1994 | 2.2127507985322 | 1993 | 2.2467178751677 | 1992 | 2.2212004954277 | 1991 | 2.2051675155979 | 1990 | 2.2546303703843 | 1989 | 2.3045913108348 | 1988 | 2.3099490893635 | 1987 | 2.3223542416611 | 1986 | 2.3598090136624 | 1985 | 2.3932409309146 | 1984 | 2.4107983427491 | 1983 | 2.4149127737113 | 1982 | 2.3566135929908 | 1981 | 2.3451534301198 | 1980 | 2.3711239936875 | 1979 | 2.3359782322018 | 1978 | 2.3279689689173 | 1977 | 2.3098219793101 | 1976 | 2.2994819648505 | 1975 | 2.3318043548191 | 1974 | 2.3542245740648 | 1973 | 2.3506021962789 | 1972 | 2.2091514724021 | 1971 | 2.1843790372364 | 1970 | 2.3130351534092 | 1969 | 2.3399770371644 | 1968 | 2.3217675457536 | 1967 | 2.2847911791007 | 1966 | 2.2925448160912 | 1965 | 2.354248261978 | 1964 | 2.4003818057174 | 1963 | 2.3990720237252 | 1962 | 2.392210066932 | 1961 | 2.3813913373516 |
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