Year | Value | 2022 | 1.1788672845172 | 2021 | 1.1678977724968 | 2020 | 1.3377025632788 | 2019 | 1.2932754280353 | 2018 | 1.1052768329086 | 2017 | 1.0523093470411 | 2016 | 1.0355439664675 | 2015 | 0.98858644465198 | 2014 | 0.99811777744571 | 2013 | 1.0438821682722 | 2012 | 1.116346363127 | 2011 | 1.1624209134467 | 2010 | 1.2099010564236 | 2009 | 1.2198180060709 | 2008 | 1.1527704961191 | 2007 | 1.1820453210987 | 2006 | 1.2408205490745 | 2005 | 1.1399343667791 | 2004 | 1.2460747657641 | 2003 | 1.3899341151553 | 2002 | 1.4544098452359 | 2001 | 1.5813014235885 | 2000 | 1.6687421067041 | 1999 | 1.6193420181055 | 1998 | 1.6952801752382 | 1997 | 1.7039708435896 | 1996 | 1.7818814848518 | 1995 | 1.8153478464176 | 1994 | 1.8287080598204 | 1993 | 1.8991238456074 | 1992 | 2.0693662286583 | 1991 | 2.2563366936015 | 1990 | 2.3277797471346 | 1989 | 2.1499296576673 | 1988 | 2.0787081610693 | 1987 | 2.4072766891218 | 1986 | 2.3675870219166 | 1985 | 2.3646261207544 | 1984 | 2.3776241549332 | 1983 | 2.4383593099687 | 1982 | 2.5828584163775 | 1981 | 2.729375067226 | 1980 | 3.0227905358386 | 1979 | 2.1596362717858 | 1978 | 2.2098714471046 | 1977 | 2.1158984635939 | 1976 | 1.9360329054677 | 1975 | 2.0847617415153 | 1974 | 2.0653789004458 | 1973 | 1.9730405478856 | 1972 | 2.183267940767 | 1971 | 2.316700610998 | 1970 | 2.6320301783265 | 1969 | 2.5662251655629 | 1968 | 2.7276825969342 | 1967 | 2.6237150370548 | 1966 | 2.639267145333 | 1965 | 2.3555584214599 | 1964 | 2.4728336584007 | 1963 | 2.1982890314696 | 1962 | 2.3099366455485 | 1961 | 2.4856270212001 | 1960 | 2.6907331596576 |
|