Year	Percent
2000-01-01	32.025
2001-01-01	32.050
2002-01-01	33.100
2003-01-01	33.725
2004-01-01	34.250
2005-01-01	34.825
2006-01-01	35.125
2007-01-01	35.850
2008-01-01	35.675
2009-01-01	38.675
2010-01-01	39.075
2011-01-01	39.275
2012-01-01	39.050
2013-01-01	39.775
2014-01-01	40.500
2015-01-01	40.025
2016-01-01	40.700
2017-01-01	41.650