Year | Value | 2022 | 50.001594413176 | 2021 | 50.040927694406 | 2020 | 50.068330866953 | 2019 | 50.098595221798 | 2018 | 50.14035030122 | 2017 | 50.182350460218 | 2016 | 50.229231615624 | 2015 | 50.276517061691 | 2014 | 50.322957990031 | 2013 | 50.362991149686 | 2012 | 50.405480019325 | 2011 | 50.455977305557 | 2010 | 50.475714448566 | 2009 | 50.462255737358 | 2008 | 50.448087626025 | 2007 | 50.435444170955 | 2006 | 50.431578188633 | 2005 | 50.428102381773 | 2004 | 50.421856167135 | 2003 | 50.414750781681 | 2002 | 50.387596899225 | 2001 | 50.3446486807 | 2000 | 50.296932012808 | 1999 | 50.235436188836 | 1998 | 50.182674199623 | 1997 | 50.135955811993 | 1996 | 50.085840184652 | 1995 | 50.034595425716 | 1994 | 49.983522980596 | 1993 | 49.928063186948 | 1992 | 49.873317498021 | 1991 | 49.820565769161 | 1990 | 49.741032035296 | 1989 | 49.624082883173 | 1988 | 49.488871311713 | 1987 | 49.343432837304 | 1986 | 49.206585194216 | 1985 | 49.096205854279 | 1984 | 49.01624204461 | 1983 | 48.997219307985 | 1982 | 48.983777736342 | 1981 | 48.923568083006 | 1980 | 48.826419789536 | 1979 | 48.709602906281 | 1978 | 48.605066224129 | 1977 | 48.504604013329 | 1976 | 48.405162170261 | 1975 | 48.303401430556 | 1974 | 48.199491428103 | 1973 | 48.09778722187 | 1972 | 47.996945787732 | 1971 | 47.901760795656 | 1970 | 47.806546956293 | 1969 | 47.708007072493 | 1968 | 47.598328218382 | 1967 | 47.474665831456 | 1966 | 47.340209946095 | 1965 | 47.2013519842 | 1964 | 47.061354532695 | 1963 | 46.918932309407 | 1962 | 46.771540415608 | 1961 | 46.623412130899 | 1960 | 46.481892249286 |
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