Year	Percent
2005-01-01	55.525
2006-01-01	56.700
2007-01-01	57.875
2008-01-01	58.600
2009-01-01	58.125
2010-01-01	57.975
2011-01-01	58.250
2012-01-01	58.225
2013-01-01	58.250
2014-01-01	58.725
2015-01-01	59.400
2016-01-01	60.350
2017-01-01	61.225