Year	Percent
1999-01-01	7.200
2000-01-01	5.775
2001-01-01	6.000
2002-01-01	6.725
2003-01-01	7.700
2004-01-01	7.525
2005-01-01	7.675
2006-01-01	7.425
2007-01-01	6.700
2008-01-01	6.500
2009-01-01	7.800
2010-01-01	8.150
2011-01-01	7.175
2012-01-01	7.725
2013-01-01	8.750
2014-01-01	9.125
2015-01-01	9.200
2016-01-01	8.150
2017-01-01	7.225