Year	Percent
1999-01-01	13.425
2000-01-01	15.775
2001-01-01	15.775
2002-01-01	15.825
2003-01-01	15.675
2004-01-01	17.550
2005-01-01	15.800
2006-01-01	13.525
2007-01-01	12.025
2008-01-01	10.225
2009-01-01	11.750
2010-01-01	13.325
2011-01-01	12.525
2012-01-01	13.425
2013-01-01	13.600
2014-01-01	12.675
2015-01-01	12.175
2016-01-01	9.800
2017-01-01	7.925