Year	Percent
2005-01-01	33.400
2006-01-01	29.800
2007-01-01	29.800
2008-01-01	31.900
2009-01-01	33.900
2010-01-01	31.175
2011-01-01	30.825
2012-01-01	31.100
2013-01-01	31.100
2014-01-01	31.650
2015-01-01	33.225
2016-01-01	32.225
2017-01-01	30.475