Year	Percent
2005-01-01	34.5
2006-01-01	33.9
2007-01-01	33.3
2008-01-01	32.9
2009-01-01	32.6
2010-01-01	32.5
2011-01-01	32.3
2012-01-01	31.4
2013-01-01	30.7
2014-01-01	30.0
2015-01-01	29.5
2016-01-01	28.6