Year	Percent
2000-01-01	21.325
2001-01-01	20.375
2002-01-01	18.925
2003-01-01	19.775
2004-01-01	19.375
2005-01-01	19.650
2006-01-01	19.000
2007-01-01	19.400
2008-01-01	20.675
2009-01-01	21.875
2010-01-01	24.175
2011-01-01	27.200
2012-01-01	29.200
2013-01-01	31.000
2014-01-01	32.925
2015-01-01	35.550
2016-01-01	37.650
2017-01-01	39.300