Year	Percent
1998-01-01	8.575
1999-01-01	7.425
2000-01-01	6.600
2001-01-01	7.250
2002-01-01	9.850
2003-01-01	12.550
2004-01-01	13.625
2005-01-01	13.900
2006-01-01	14.925
2007-01-01	13.800
2008-01-01	13.625
2009-01-01	19.050
2010-01-01	21.625
2011-01-01	29.000
2012-01-01	36.750
2013-01-01	36.675
2014-01-01	34.250
2015-01-01	29.575
2016-01-01	27.275
2017-01-01	22.450