Year	Percent
2000-01-01	35.5236793379853
2001-01-01	35.0912663632018
2002-01-01	34.3547570271928
2003-01-01	34.5266988354090
2004-01-01	33.6968484509591
2005-01-01	33.6545802264009
2006-01-01	33.6040876818537
2007-01-01	33.5868730045701
2008-01-01	33.8479093149458
2009-01-01	34.4883354599691
2010-01-01	34.1134512376522
2011-01-01	33.7806620597902
2012-01-01	33.4698333708786
2013-01-01	33.2232820256384
2014-01-01	31.9760730871386
2015-01-01	31.5632266264345
2016-01-01	31.3163678195897
2017-01-01	30.7643037817146