Year	Percent
2005-01-01	47.5968140005180
2006-01-01	48.7379757821285
2007-01-01	50.5650826650082
2008-01-01	52.6607212576461
2009-01-01	52.7876240106720
2010-01-01	57.7232485299712
2011-01-01	60.6229724286645
2012-01-01	61.1907990453783
2013-01-01	62.6294442783270
2014-01-01	63.4071219601631
2015-01-01	63.4034338121995
2016-01-01	63.7879292598067
2017-01-01	64.1343224859332