Year | Value | 2021 | 37.630650943755 | 2020 | 37.570126466902 | 2019 | 37.467319889104 | 2018 | 37.427936652615 | 2017 | 37.411606091679 | 2016 | 37.396035091717 | 2015 | 37.395503399035 | 2014 | 37.396650336106 | 2013 | 37.397797273176 | 2012 | 37.398944210246 | 2011 | 37.400091147317 | 2010 | 37.401238084387 | 2009 | 37.402119175117 | 2008 | 37.403000265846 | 2007 | 37.403881356576 | 2006 | 37.404762447306 | 2005 | 37.405643538035 | 2004 | 37.406524628765 | 2003 | 37.407405719494 | 2002 | 37.408286810224 | 2001 | 37.409167900953 | 2000 | 37.410048991683 | 1999 | 37.228449356272 | 1998 | 37.046849720861 | 1997 | 36.865250085451 | 1996 | 36.68365045004 | 1995 | 36.502050814629 | 1994 | 36.320451179218 | 1993 | 36.138851543808 | 1992 | 35.957251908397 | 1991 | 35.775652272986 | 1990 | 35.594052637576 |
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