Year | Value | 2022 | 50.658055095534 | 2021 | 50.659747680076 | 2020 | 50.658861955698 | 2019 | 50.662061103687 | 2018 | 50.66772021891 | 2017 | 50.679425419913 | 2016 | 50.699571899784 | 2015 | 50.732561676082 | 2014 | 50.780116865836 | 2013 | 50.837706353031 | 2012 | 50.903275978283 | 2011 | 50.971555122658 | 2010 | 51.04073785839 | 2009 | 51.109944220826 | 2008 | 51.176722026423 | 2007 | 51.235265692688 | 2006 | 51.282784556771 | 2005 | 51.318707561162 | 2004 | 51.341030043152 | 2003 | 51.354333378285 | 2002 | 51.362590623796 | 2001 | 51.366256397261 | 2000 | 51.368206689361 | 1999 | 51.373503170453 | 1998 | 51.385119958528 | 1997 | 51.405146713397 | 1996 | 51.437706105587 | 1995 | 51.484145201163 | 1994 | 51.544940843914 | 1993 | 51.6184839857 | 1992 | 51.700918259117 | 1991 | 51.790742355942 | 1990 | 51.887669522701 | 1989 | 51.987033423886 | 1988 | 52.082950368086 | 1987 | 52.172563779683 | 1986 | 52.253750439072 | 1985 | 52.322390111914 | 1984 | 52.377284965359 | 1983 | 52.423646248184 | 1982 | 52.464545036022 | 1981 | 52.500184431927 | 1980 | 52.529780057653 | 1979 | 52.553840638617 | 1978 | 52.573728234853 | 1977 | 52.591205624987 | 1976 | 52.608399731837 | 1975 | 52.625235419672 | 1974 | 52.642294441806 | 1973 | 52.659212386477 | 1972 | 52.678118980276 | 1971 | 52.704458274963 | 1970 | 52.735498955273 | 1969 | 52.767787104846 | 1968 | 52.804968016048 | 1967 | 52.848037202589 | 1966 | 52.89574025229 | 1965 | 52.947880208901 | 1964 | 53.003745728522 | 1963 | 53.063604807714 | 1962 | 53.127198236493 | 1961 | 53.196448481452 | 1960 | 53.270224014813 |
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