Year	Percent
2000-01-01	15.850
2001-01-01	16.325
2002-01-01	16.825
2003-01-01	18.075
2004-01-01	18.275
2005-01-01	18.375
2006-01-01	18.750
2007-01-01	18.375
2008-01-01	17.250
2009-01-01	18.725
2010-01-01	19.400
2011-01-01	20.100
2012-01-01	19.425
2013-01-01	19.750
2014-01-01	19.925
2015-01-01	19.700
2016-01-01	19.875
2017-01-01	20.675