Year	Percent
2005-01-01	31.4078253146115
2006-01-01	32.9397662126959
2007-01-01	33.3839155011584
2008-01-01	33.4044040068927
2009-01-01	34.0377815304016
2010-01-01	34.9877922428176
2011-01-01	35.7141562114579
2012-01-01	37.2814036281222
2013-01-01	37.4610047512382
2014-01-01	36.7556015371258
2015-01-01	37.1477436528490
2016-01-01	37.5236485118352
2017-01-01	36.8272709826261