Year | Value | 2022 | 49.106548350257 | 2021 | 49.126649332126 | 2020 | 49.146859506533 | 2019 | 49.163463535518 | 2018 | 49.177392094744 | 2017 | 49.191640812765 | 2016 | 49.209415867608 | 2015 | 49.227336922217 | 2014 | 49.240813104711 | 2013 | 49.25367672394 | 2012 | 49.26893626198 | 2011 | 49.285196739766 | 2010 | 49.302319003321 | 2009 | 49.319903264872 | 2008 | 49.337521591127 | 2007 | 49.357002297307 | 2006 | 49.37878785969 | 2005 | 49.402043928528 | 2004 | 49.42754991076 | 2003 | 49.454614829064 | 2002 | 49.482059136891 | 2001 | 49.510289384129 | 2000 | 49.53800374496 | 1999 | 49.560933293625 | 1998 | 49.578967010509 | 1997 | 49.59650027455 | 1996 | 49.613941754543 | 1995 | 49.631544022588 | 1994 | 49.648690308226 | 1993 | 49.665197191066 | 1992 | 49.682199814382 | 1991 | 49.699379035428 | 1990 | 49.716819677375 | 1989 | 49.730638978314 | 1988 | 49.740178879651 | 1987 | 49.749638974179 | 1986 | 49.758519479856 | 1985 | 49.766361624287 | 1984 | 49.773391384005 | 1983 | 49.779823797042 | 1982 | 49.786309064152 | 1981 | 49.793368212306 | 1980 | 49.801068184866 | 1979 | 49.809743297427 | 1978 | 49.819536180289 | 1977 | 49.830248206497 | 1976 | 49.841493807731 | 1975 | 49.853520013222 | 1974 | 49.866906378732 | 1973 | 49.881882263987 | 1972 | 49.898051664799 | 1971 | 49.915147160335 | 1970 | 49.932995139819 | 1969 | 49.951462430775 | 1968 | 49.971195486378 | 1967 | 49.992019998189 | 1966 | 50.013393419212 | 1965 | 50.035366550243 | 1964 | 50.057845105529 | 1963 | 50.080808423341 | 1962 | 50.104696931353 | 1961 | 50.130339824204 | 1960 | 50.153005406915 |
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