Year	Percent
2005-01-01	2.73044695450453
2006-01-01	2.71736960932272
2007-01-01	2.69027379602146
2008-01-01	3.07959500465823
2009-01-01	4.59251843631835
2010-01-01	4.60298618676046
2011-01-01	4.39544939292688
2012-01-01	4.13132703570366
2013-01-01	4.21606868550227
2014-01-01	4.11480499649077
2015-01-01	3.65342777861235
2016-01-01	3.34678258580768
2017-01-01	2.84713305807602