Year	Percent
2005-01-01	23.8184968947142
2006-01-01	21.5849351469746
2007-01-01	20.7331855808477
2008-01-01	22.9802908607587
2009-01-01	24.4572637690261
2010-01-01	21.6449781561741
2011-01-01	21.0937819685139
2012-01-01	19.1048389096210
2013-01-01	19.1094378860906
2014-01-01	19.6872247922305
2015-01-01	18.1909814187343
2016-01-01	17.5984554886128
2017-01-01	18.5584988112923