Year | Value | 2022 | 50.15124467344 | 2021 | 50.150520739404 | 2020 | 50.151320303701 | 2019 | 50.153588176136 | 2018 | 50.156744648878 | 2017 | 50.162971177521 | 2016 | 50.172448327394 | 2015 | 50.183442488755 | 2014 | 50.193081130052 | 2013 | 50.200791243392 | 2012 | 50.208419478269 | 2011 | 50.215723378377 | 2010 | 50.224070428376 | 2009 | 50.231212793426 | 2008 | 50.237900095874 | 2007 | 50.248065295262 | 2006 | 50.260097626421 | 2005 | 50.272071838929 | 2004 | 50.283957843746 | 2003 | 50.297024951616 | 2002 | 50.310706328384 | 2001 | 50.319993548242 | 2000 | 50.326623845831 | 1999 | 50.330395607634 | 1998 | 50.328303111782 | 1997 | 50.328540840153 | 1996 | 50.326219014284 | 1995 | 50.323373234293 | 1994 | 50.326807416499 | 1993 | 50.336020822625 | 1992 | 50.347154446031 | 1991 | 50.358183268538 | 1990 | 50.367328078473 | 1989 | 50.372545015926 | 1988 | 50.372682733608 | 1987 | 50.37553733012 | 1986 | 50.385373770506 | 1985 | 50.392842298143 | 1984 | 50.392535917653 | 1983 | 50.383762139271 | 1982 | 50.375122524954 | 1981 | 50.365550725771 | 1980 | 50.356472000033 | 1979 | 50.349810012791 | 1978 | 50.345150072737 | 1977 | 50.342957524041 | 1976 | 50.345797524748 | 1975 | 50.353094449879 | 1974 | 50.361932169209 | 1973 | 50.368380731553 | 1972 | 50.370639765192 | 1971 | 50.373994381765 | 1970 | 50.379081796454 | 1969 | 50.383758194619 | 1968 | 50.388756781027 | 1967 | 50.393237894817 | 1966 | 50.396891638615 | 1965 | 50.399588154964 | 1964 | 50.401467973319 | 1963 | 50.403657279028 | 1962 | 50.406887652655 | 1961 | 50.406632794203 | 1960 | 50.401001906586 |
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