Year	Percent
2005-01-01	19.300
2006-01-01	19.000
2007-01-01	18.400
2008-01-01	18.700
2009-01-01	19.000
2010-01-01	19.875
2011-01-01	19.475
2012-01-01	19.550
2013-01-01	19.950
2014-01-01	19.900
2015-01-01	19.700
2016-01-01	19.425
2017-01-01	19.125