Year | Value | 2022 | 47.353385985549 | 2021 | 47.308656817349 | 2020 | 47.325878896996 | 2019 | 47.38102766041 | 2018 | 47.470926567153 | 2017 | 47.552818457731 | 2016 | 47.635014128229 | 2015 | 47.7156388553 | 2014 | 47.801553045377 | 2013 | 47.918605372542 | 2012 | 48.076257226495 | 2011 | 48.254766751575 | 2010 | 48.442251295869 | 2009 | 48.612545314731 | 2008 | 48.763999821516 | 2007 | 48.906878007359 | 2006 | 49.041828849621 | 2005 | 49.172711712446 | 2004 | 49.302956973381 | 2003 | 49.447315532587 | 2002 | 49.551757184623 | 2001 | 49.622209642883 | 2000 | 49.720209842618 | 1999 | 49.821775144927 | 1998 | 49.896992171405 | 1997 | 50.088199553122 | 1996 | 50.181336863005 | 1995 | 50.03278249816 | 1994 | 49.907916474826 | 1993 | 49.87404162103 | 1992 | 49.897123603574 | 1991 | 49.935892075703 | 1990 | 49.995074376909 | 1989 | 50.053310208549 | 1988 | 50.134368039089 | 1987 | 50.153127131805 | 1986 | 50.090010976948 | 1985 | 50.02874707001 | 1984 | 49.968817747156 | 1983 | 49.908015375641 | 1982 | 49.851734778355 | 1981 | 49.793720612771 | 1980 | 49.738091591362 | 1979 | 49.696885342241 | 1978 | 49.662383944481 | 1977 | 49.574137985625 | 1976 | 49.492610282884 | 1975 | 49.47409874801 | 1974 | 49.464114993039 | 1973 | 49.457667197861 | 1972 | 49.495197363809 | 1971 | 49.579847021223 | 1970 | 49.640486217106 | 1969 | 49.698670383065 | 1968 | 49.762584928969 | 1967 | 49.832749440849 | 1966 | 49.906663420177 | 1965 | 49.982336928288 | 1964 | 50.05422878166 | 1963 | 50.130536941955 | 1962 | 50.221263537103 | 1961 | 50.309938466429 | 1960 | 50.413510320384 |
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