Year	Percent
2000-01-01	38.6830680334359
2001-01-01	39.1883239601123
2002-01-01	39.6250316643841
2003-01-01	40.6587153644616
2004-01-01	41.3236901118799
2005-01-01	42.9272865264065
2006-01-01	44.6399596388158
2007-01-01	44.9885424212529
2008-01-01	44.9413207823994
2009-01-01	42.3943309954104
2010-01-01	40.8155257655822
2011-01-01	42.3529356172253
2012-01-01	43.2541092468716
2013-01-01	43.6100414008805