Year	Percent
1999-01-01	15.675
2000-01-01	15.575
2001-01-01	15.800
2002-01-01	15.675
2003-01-01	15.175
2004-01-01	15.025
2005-01-01	14.500
2006-01-01	13.075
2007-01-01	12.800
2008-01-01	12.650
2009-01-01	12.900
2010-01-01	12.700
2011-01-01	11.775
2012-01-01	10.600
2013-01-01	10.500
2014-01-01	8.775
2015-01-01	8.025
2016-01-01	7.650
2017-01-01	6.750