Year	Percent
2005-01-01	21.975
2006-01-01	21.750
2007-01-01	21.550
2008-01-01	21.425
2009-01-01	21.725
2010-01-01	21.925
2011-01-01	22.075
2012-01-01	21.825
2013-01-01	21.900
2014-01-01	21.975
2015-01-01	21.875
2016-01-01	21.725
2017-01-01	21.525