Year | Value | 2022 | 49.532105541087 | 2021 | 49.55361327677 | 2020 | 49.576141893145 | 2019 | 49.574786282231 | 2018 | 49.550720074365 | 2017 | 49.522851436094 | 2016 | 49.491563188288 | 2015 | 49.459513896193 | 2014 | 49.426639733686 | 2013 | 49.389629189062 | 2012 | 49.348823468924 | 2011 | 49.305790587494 | 2010 | 49.284957618629 | 2009 | 49.288165283928 | 2008 | 49.291598638019 | 2007 | 49.294330755241 | 2006 | 49.29428284336 | 2005 | 49.289222526752 | 2004 | 49.281126299914 | 2003 | 49.275652693887 | 2002 | 49.278174953711 | 2001 | 49.276529082868 | 2000 | 49.258378336287 | 1999 | 49.22743130232 | 1998 | 49.195613539169 | 1997 | 49.170517597114 | 1996 | 49.149011338622 | 1995 | 49.128729733989 | 1994 | 49.109265488322 | 1993 | 49.091121946632 | 1992 | 49.071024141228 | 1991 | 49.044841421585 | 1990 | 49.017670073412 | 1989 | 48.992859079508 | 1988 | 48.970977476637 | 1987 | 48.953600753084 | 1986 | 48.935413652952 | 1985 | 48.915787823442 | 1984 | 48.899158378481 | 1983 | 48.885093644151 | 1982 | 48.875592714792 | 1981 | 48.871953811408 | 1980 | 48.875518838473 | 1979 | 48.888233768072 | 1978 | 48.911335364229 | 1977 | 48.941650209458 | 1976 | 48.969795901972 | 1975 | 48.995938150407 | 1974 | 49.020324478019 | 1973 | 49.040889787456 | 1972 | 49.051807277539 | 1971 | 49.042935443121 | 1970 | 49.016616397556 | 1969 | 49.009952685792 | 1968 | 49.047204086272 | 1967 | 49.13097331344 | 1966 | 49.247763137076 | 1965 | 49.357415361905 | 1964 | 49.432510751101 | 1963 | 49.48588418024 | 1962 | 49.541515035123 | 1961 | 49.600487484807 | 1960 | 49.653312071879 |
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