Year	Percent
2000-01-01	37.275
2001-01-01	41.025
2002-01-01	43.300
2003-01-01	43.100
2004-01-01	41.950
2005-01-01	38.350
2006-01-01	31.650
2007-01-01	23.750
2008-01-01	19.850
2009-01-01	21.225
2010-01-01	25.450
2011-01-01	28.800
2012-01-01	29.950
2013-01-01	30.075
2014-01-01	25.475
2015-01-01	20.900
2016-01-01	17.950
2017-01-01	15.125