Year	Percent
2000-01-01	21.800
2001-01-01	21.450
2002-01-01	19.325
2003-01-01	18.350
2004-01-01	18.550
2005-01-01	19.600
2006-01-01	20.975
2007-01-01	22.375
2008-01-01	23.700
2009-01-01	23.150
2010-01-01	22.100
2011-01-01	19.975
2012-01-01	19.875
2013-01-01	19.525
2014-01-01	21.325
2015-01-01	21.300
2016-01-01	23.725
2017-01-01	25.175