Year	Percent
2005-01-01	42.300
2006-01-01	41.400
2007-01-01	39.700
2008-01-01	38.400
2009-01-01	39.000
2010-01-01	41.000
2011-01-01	39.400
2012-01-01	38.150
2013-01-01	36.750
2014-01-01	35.875
2015-01-01	33.750
2016-01-01	32.075
2017-01-01	31.975