Year | Value | 2022 | 1.0591450173188 | 2021 | 1.0930839572306 | 2020 | 1.1942132122177 | 2019 | 1.265303680842 | 2018 | 1.2964336932478 | 2017 | 1.3210201436936 | 2016 | 1.3634038305227 | 2015 | 1.3953709238749 | 2014 | 1.4049145225934 | 2013 | 1.4248865378953 | 2012 | 1.4627296247449 | 2011 | 1.5313475991915 | 2010 | 1.5494856218736 | 2009 | 1.5307640989704 | 2008 | 1.5564844819184 | 2007 | 1.602126892691 | 2006 | 1.6296215457832 | 2005 | 1.6580946294984 | 2004 | 1.7010787160118 | 2003 | 1.7184009732753 | 2002 | 1.781771920009 | 2001 | 1.866038289738 | 2000 | 1.8856523805923 | 1999 | 1.9012519370054 | 1998 | 1.9520993395264 | 1997 | 2.0204830600471 | 1996 | 2.0602182726459 | 1995 | 2.003514266104 | 1994 | 2.0050073648828 | 1993 | 2.0994246257315 | 1992 | 2.2017684925759 | 1991 | 2.3290702410602 | 1990 | 2.4572823203075 | 1989 | 2.3607083315499 | 1988 | 2.3971145339003 | 1987 | 2.4232095525624 | 1986 | 2.4486663701351 | 1985 | 2.4611311946282 | 1984 | 2.4834074667725 | 1983 | 2.5257422572445 | 1982 | 2.5983618377555 | 1981 | 2.5950154830579 | 1980 | 2.5010371976133 | 1979 | 2.4550477105872 | 1978 | 2.4329443292836 | 1977 | 2.4210823207669 | 1976 | 2.421342433623 | 1975 | 2.4450758216619 | 1974 | 2.4724239827535 | 1973 | 2.4833126104149 | 1972 | 2.4021000415302 | 1971 | 2.3900616808585 | 1970 | 2.4788969247332 | 1969 | 2.5106348053715 | 1968 | 2.5028604351904 | 1967 | 2.4797833561823 | 1966 | 2.4556382372354 | 1965 | 2.5080723313087 | 1964 | 2.5657553223412 | 1963 | 2.5598187626008 | 1962 | 2.5532602345537 | 1961 | 2.537911285869 |
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