Year	Percent
1999-01-01	12.775
2000-01-01	12.475
2001-01-01	11.300
2002-01-01	12.650
2003-01-01	13.350
2004-01-01	15.475
2005-01-01	19.400
2006-01-01	19.125
2007-01-01	18.000
2008-01-01	19.500
2009-01-01	26.375
2010-01-01	26.425
2011-01-01	25.950
2012-01-01	28.225
2013-01-01	26.600
2014-01-01	20.400
2015-01-01	17.300
2016-01-01	12.950
2017-01-01	10.700