Year	Percent
2000-01-01	23.900
2001-01-01	23.775
2002-01-01	23.550
2003-01-01	24.600
2004-01-01	24.900
2005-01-01	25.100
2006-01-01	25.225
2007-01-01	24.125
2008-01-01	22.775
2009-01-01	23.575
2010-01-01	24.475
2011-01-01	24.300
2012-01-01	24.175
2013-01-01	24.050
2014-01-01	24.100
2015-01-01	23.925
2016-01-01	24.150
2017-01-01	24.800