Year	Percent
1999-01-01	11.050
2000-01-01	9.675
2001-01-01	7.600
2002-01-01	8.350
2003-01-01	8.525
2004-01-01	8.300
2005-01-01	7.200
2006-01-01	6.400
2007-01-01	6.450
2008-01-01	10.125
2009-01-01	17.775
2010-01-01	19.675
2011-01-01	21.150
2012-01-01	24.750
2013-01-01	25.725
2014-01-01	23.725
2015-01-01	20.900
2016-01-01	18.225
2017-01-01	15.775