Year	Percent
1999-01-01	8.925
2000-01-01	6.800
2001-01-01	8.175
2002-01-01	7.350
2003-01-01	9.125
2004-01-01	8.900
2005-01-01	8.650
2006-01-01	7.875
2007-01-01	7.625
2008-01-01	7.400
2009-01-01	13.275
2010-01-01	16.075
2011-01-01	15.675
2012-01-01	14.750
2013-01-01	14.250
2014-01-01	13.750
2015-01-01	11.600
2016-01-01	13.100
2017-01-01	11.400