Year | Value | 2022 | 50.082381932547 | 2021 | 50.085196127916 | 2020 | 50.094017390995 | 2019 | 50.099199567721 | 2018 | 50.096362826348 | 2017 | 50.096605525919 | 2016 | 50.104559634889 | 2015 | 50.109325517148 | 2014 | 50.111427831044 | 2013 | 50.115255945322 | 2012 | 50.119925018763 | 2011 | 50.130121231069 | 2010 | 50.154821782336 | 2009 | 50.187673158868 | 2008 | 50.217596279717 | 2007 | 50.246537532837 | 2006 | 50.275051684703 | 2005 | 50.303646262229 | 2004 | 50.333371290803 | 2003 | 50.363872644574 | 2002 | 50.393710407516 | 2001 | 50.424427101147 | 2000 | 50.457322378266 | 1999 | 50.491305281237 | 1998 | 50.526643780202 | 1997 | 50.560296655825 | 1996 | 50.591665549316 | 1995 | 50.618725490423 | 1994 | 50.643500338684 | 1993 | 50.669623940357 | 1992 | 50.676491891352 | 1991 | 50.65345449221 | 1990 | 50.62396956246 | 1989 | 50.599028796593 | 1988 | 50.576060917626 | 1987 | 50.55104427559 | 1986 | 50.523373587322 | 1985 | 50.497769467953 | 1984 | 50.473267211169 | 1983 | 50.450120639964 | 1982 | 50.385434635543 | 1981 | 50.230219596315 | 1980 | 50.028925686746 | 1979 | 49.827504314253 | 1978 | 49.626717873414 | 1977 | 49.424753280704 | 1976 | 49.219872146569 | 1975 | 49.126022121548 | 1974 | 49.333857551439 | 1973 | 49.545339285851 | 1972 | 49.559000648529 | 1971 | 49.5471072123 | 1970 | 49.523099106747 | 1969 | 49.490516173305 | 1968 | 49.452606680033 | 1967 | 49.410621400521 | 1966 | 49.366010993212 | 1965 | 49.329467315682 | 1964 | 49.31132805738 | 1963 | 49.298435770386 | 1962 | 49.276237533169 | 1961 | 49.250551893082 | 1960 | 49.234196935422 |
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