Year | Value | 2022 | 1.7262933880978 | 2021 | 2.2536913293529 | 2020 | 2.294676290654 | 2019 | 2.2486962563477 | 2018 | 2.2144311331816 | 2017 | 2.2487764097886 | 2016 | 2.2633004533286 | 2015 | 2.2657870194402 | 2014 | 2.3414990710257 | 2013 | 2.4464479065237 | 2012 | 2.460258309441 | 2011 | 2.4485908275067 | 2010 | 2.4904407162721 | 2009 | 2.4940784404078 | 2008 | 2.411130665686 | 2007 | 2.3620760410543 | 2006 | 2.4259201106825 | 2005 | 2.4326669579048 | 2004 | 2.4282227822704 | 2003 | 2.5253349614569 | 2002 | 2.4590635195597 | 2001 | 2.2504055392865 | 2000 | 2.2497565971446 | 1999 | 2.2760453487059 | 1998 | 2.2154042899885 | 1997 | 2.1736345481915 | 1996 | 2.2569113078988 | 1995 | 2.644433605272 | 1994 | 2.7954802007026 | 1993 | 2.6838305957057 | 1992 | 2.5199544412467 | 1991 | 2.235850740938 | 1990 | 2.6472876935379 | 1989 | 2.2774743625664 | 1988 | 2.2088141979517 | 1987 | 2.2653414552341 | 1986 | 2.2854046285772 | 1985 | 2.3586776250426 | 1984 | 2.3495265873542 | 1983 | 2.2998218705261 | 1982 | 2.2034703433228 | 1981 | 2.0909486896264 | 1980 | 2.2649204212111 | 1979 | 2.4006726362333 | 1978 | 2.3529288631799 | 1977 | 2.4499672858664 | 1976 | 2.4905023975722 | 1975 | 2.3944072679456 | 1974 | 2.3640592453958 | 1973 | 2.2994649728531 | 1972 | 2.2771724520518 | 1971 | 2.2625954414278 | 1970 | 2.2333495467035 | 1969 | 2.2352715884171 | 1968 | 2.2365419099421 | 1967 | 2.2172827454106 | 1966 | 2.2095316576148 | 1965 | 2.2247940783533 | 1964 | 2.2197219973969 | 1963 | 2.2016755187492 | 1962 | 2.1875657358054 | 1961 | 2.1473606303942 |
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