Year	Percent
1998-01-01	11.725
1999-01-01	17.700
2000-01-01	18.700
2001-01-01	17.850
2002-01-01	16.575
2003-01-01	18.325
2004-01-01	22.200
2005-01-01	19.325
2006-01-01	16.625
2007-01-01	10.600
2008-01-01	9.800
2009-01-01	16.550
2010-01-01	18.250
2011-01-01	18.125
2012-01-01	19.850
2013-01-01	18.625
2014-01-01	15.050
2015-01-01	11.275
2016-01-01	9.900
2017-01-01	7.350