Year	Percent
1999-01-01	42.750
2000-01-01	42.550
2001-01-01	41.300
2002-01-01	39.200
2003-01-01	37.200
2004-01-01	35.675
2005-01-01	32.425
2006-01-01	30.850
2007-01-01	30.225
2008-01-01	26.750
2009-01-01	25.400
2010-01-01	25.525
2011-01-01	22.700
2012-01-01	23.600
2013-01-01	23.700
2014-01-01	23.575
2015-01-01	24.875
2016-01-01	24.700
2017-01-01	26.475