Year	Percent
1998-01-01	29.825
1999-01-01	29.250
2000-01-01	27.650
2001-01-01	25.025
2002-01-01	24.025
2003-01-01	24.225
2004-01-01	20.625
2005-01-01	21.600
2006-01-01	19.250
2007-01-01	18.375
2008-01-01	18.875
2009-01-01	23.175
2010-01-01	26.825
2011-01-01	27.025
2012-01-01	33.750
2013-01-01	39.000
2014-01-01	41.300
2015-01-01	38.825
2016-01-01	36.475
2017-01-01	33.025