Year	Percent
1999-01-01	13.400
2000-01-01	13.750
2001-01-01	15.775
2002-01-01	14.225
2003-01-01	14.650
2004-01-01	17.825
2005-01-01	18.475
2006-01-01	20.950
2007-01-01	22.150
2008-01-01	21.100
2009-01-01	24.775
2010-01-01	24.525
2011-01-01	22.750
2012-01-01	25.025
2013-01-01	25.225
2014-01-01	29.025
2015-01-01	30.525
2016-01-01	33.375
2017-01-01	37.450