Year | Value | 2022 | 1.1355997524307 | 2021 | 1.1820633753903 | 2020 | 1.4019046260393 | 2019 | 1.9096832633366 | 2018 | 1.8909093071313 | 2017 | 1.5533562664873 | 2016 | 1.4933898725565 | 2015 | 1.4798352375796 | 2014 | 1.4835986023192 | 2013 | 1.5324232376039 | 2012 | 1.6025218719882 | 2011 | 1.6418831172089 | 2010 | 1.6603104805354 | 2009 | 1.6824793328929 | 2008 | 1.7042058119477 | 2007 | 1.7181335805958 | 2006 | 1.7211150348254 | 2005 | 1.7244331774132 | 2004 | 1.739579860392 | 2003 | 1.7486932014909 | 2002 | 1.7370931538238 | 2001 | 1.7196855894217 | 2000 | 1.7130881704317 | 1999 | 1.7256665181978 | 1998 | 1.7518151638572 | 1997 | 1.7895227545746 | 1996 | 1.8300967421262 | 1995 | 1.8685590602886 | 1994 | 1.9112539392402 | 1993 | 1.9831601483512 | 1992 | 2.1106127281471 | 1991 | 2.2374201919272 | 1990 | 2.3200628699931 | 1989 | 2.3826431546818 | 1988 | 2.4409557366799 | 1987 | 2.490103410734 | 1986 | 2.5159231473228 | 1985 | 2.5314951384844 | 1984 | 2.5491911416887 | 1983 | 2.5710747157044 | 1982 | 2.5998779963342 | 1981 | 2.6293499652804 | 1980 | 2.6574057079697 | 1979 | 2.6834895720005 | 1978 | 2.7079362055816 | 1977 | 2.7321368390107 | 1976 | 2.7560542438465 | 1975 | 2.7777239085248 | 1974 | 2.7978067683364 | 1973 | 2.8191390280598 | 1972 | 2.8359221427798 | 1971 | 2.8545694641186 | 1970 | 2.8792254712841 | 1969 | 2.8992701201604 | 1968 | 2.9123516504105 | 1967 | 2.9172228410437 | 1966 | 2.924760532851 | 1965 | 2.9290823175173 | 1964 | 2.9157395958945 | 1963 | 2.9002031564522 | 1962 | 2.8817380888455 | 1961 | 2.846590659468 |
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