Year	Percent
2000-01-01	27.200
2001-01-01	26.600
2002-01-01	24.150
2003-01-01	23.950
2004-01-01	24.775
2005-01-01	25.400
2006-01-01	26.950
2007-01-01	29.250
2008-01-01	30.925
2009-01-01	30.350
2010-01-01	30.500
2011-01-01	29.550
2012-01-01	29.250
2013-01-01	28.625
2014-01-01	29.975
2015-01-01	30.450
2016-01-01	32.850
2017-01-01	33.900