Year	Percent
2005-01-01	40.700
2006-01-01	40.200
2007-01-01	40.100
2008-01-01	38.700
2009-01-01	38.400
2010-01-01	40.025
2011-01-01	39.450
2012-01-01	39.175
2013-01-01	38.850
2014-01-01	38.100
2015-01-01	37.700
2016-01-01	37.175
2017-01-01	37.400