Year	Percent
2005-01-01	51.250
2006-01-01	51.925
2007-01-01	52.650
2008-01-01	52.825
2009-01-01	51.600
2010-01-01	51.125
2011-01-01	51.100
2012-01-01	50.650
2013-01-01	50.200
2014-01-01	50.300
2015-01-01	50.650
2016-01-01	51.375
2017-01-01	52.000