Year | Value | 2022 | 48.963678674854 | 2021 | 48.925073983894 | 2020 | 48.908432241766 | 2019 | 49.1792832077 | 2018 | 49.144891115881 | 2017 | 48.906783080817 | 2016 | 49.060120908407 | 2015 | 49.219303578264 | 2014 | 49.384049047083 | 2013 | 49.558614968826 | 2012 | 49.666382603506 | 2011 | 49.701033282722 | 2010 | 49.7350026473 | 2009 | 49.767456719263 | 2008 | 49.798846383345 | 2007 | 49.830209604228 | 2006 | 49.862006126321 | 2005 | 49.895025595327 | 2004 | 49.92924999737 | 2003 | 49.961475856012 | 2002 | 49.95416421705 | 2001 | 49.909648345834 | 2000 | 49.864238371335 | 1999 | 49.817681467625 | 1998 | 49.772233800319 | 1997 | 49.729545782569 | 1996 | 49.686094608206 | 1995 | 49.638613841629 | 1994 | 49.588550936167 | 1993 | 49.537533341631 | 1992 | 49.486038888695 | 1991 | 49.463778867243 | 1990 | 49.482811236809 | 1989 | 49.509029787607 | 1988 | 49.530357966906 | 1987 | 49.548779242274 | 1986 | 49.564871152935 | 1985 | 49.578928159592 | 1984 | 49.591305233071 | 1983 | 49.602503687183 | 1982 | 49.613090160959 | 1981 | 49.62241209923 | 1980 | 49.63440147216 | 1979 | 49.650217823009 | 1978 | 49.665174360436 | 1977 | 49.679922456388 | 1976 | 49.694580208691 | 1975 | 49.708955323972 | 1974 | 49.722041857067 | 1973 | 49.733169832777 | 1972 | 49.742380130583 | 1971 | 49.74940608261 | 1970 | 49.762428377579 | 1969 | 49.781943013483 | 1968 | 49.800477338104 | 1967 | 49.817943187609 | 1966 | 49.833318507149 | 1965 | 49.847971492156 | 1964 | 49.859817566282 | 1963 | 49.869422251866 | 1962 | 49.878230850499 | 1961 | 49.887274315024 | 1960 | 49.870627108865 |
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