Year	Percent
1999-01-01	11.000
2000-01-01	9.600
2001-01-01	7.525
2002-01-01	8.300
2003-01-01	8.525
2004-01-01	8.250
2005-01-01	7.150
2006-01-01	6.375
2007-01-01	6.425
2008-01-01	10.075
2009-01-01	17.675
2010-01-01	19.575
2011-01-01	21.050
2012-01-01	24.625
2013-01-01	25.625
2014-01-01	23.600
2015-01-01	20.800
2016-01-01	18.125
2017-01-01	15.650