Year	Percent
1999-01-01	6.200
2000-01-01	5.675
2001-01-01	5.150
2002-01-01	5.175
2003-01-01	5.300
2004-01-01	5.450
2005-01-01	6.400
2006-01-01	6.850
2007-01-01	6.825
2008-01-01	7.150
2009-01-01	9.150
2010-01-01	10.425
2011-01-01	10.200
2012-01-01	10.000
2013-01-01	9.125
2014-01-01	6.800
2015-01-01	6.025
2016-01-01	4.525
2017-01-01	3.675