Year | Value | 2022 | 49.318634866144 | 2021 | 49.341761581686 | 2020 | 49.34792217091 | 2019 | 49.46837241892 | 2018 | 49.411879639186 | 2017 | 49.2385062427 | 2016 | 49.255511015225 | 2015 | 49.28169667102 | 2014 | 49.30393799792 | 2013 | 49.318227091979 | 2012 | 49.32902304777 | 2011 | 49.339586766384 | 2010 | 49.355312643587 | 2009 | 49.37620923914 | 2008 | 49.396145757871 | 2007 | 49.409868571647 | 2006 | 49.419101631977 | 2005 | 49.434106970034 | 2004 | 49.455028460768 | 2003 | 49.47294074536 | 2002 | 49.491293972201 | 2001 | 49.507570409251 | 2000 | 49.516627721151 | 1999 | 49.518221817653 | 1998 | 49.520328571904 | 1997 | 49.520509857978 | 1996 | 49.522473150535 | 1995 | 49.527840944716 | 1994 | 49.531924637677 | 1993 | 49.535539353959 | 1992 | 49.534500918707 | 1991 | 49.534015972118 | 1990 | 49.529339496162 | 1989 | 49.525159010038 | 1988 | 49.521344846232 | 1987 | 49.518288315649 | 1986 | 49.515936762663 | 1985 | 49.509120384069 | 1984 | 49.502889646481 | 1983 | 49.492304526784 | 1982 | 49.483035760582 | 1981 | 49.470506128057 | 1980 | 49.451257789143 | 1979 | 49.435858708454 | 1978 | 49.416406993085 | 1977 | 49.395993132987 | 1976 | 49.386529499033 | 1975 | 49.376717832824 | 1974 | 49.354940108104 | 1973 | 49.331117525179 | 1972 | 49.30767172969 | 1971 | 49.283693119894 | 1970 | 49.262809817068 | 1969 | 49.302707220822 | 1968 | 49.406685343273 | 1967 | 49.520185082679 | 1966 | 49.643379634394 | 1965 | 49.760679489306 | 1964 | 49.86079468009 | 1963 | 49.952320371455 | 1962 | 50.046680786234 | 1961 | 50.144619596129 | 1960 | 50.198037218011 |
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