Year	Percent
1999-01-01	11.275
2000-01-01	13.300
2001-01-01	14.850
2002-01-01	17.625
2003-01-01	21.775
2004-01-01	25.050
2005-01-01	26.750
2006-01-01	26.625
2007-01-01	25.800
2008-01-01	25.250
2009-01-01	26.300
2010-01-01	29.400
2011-01-01	31.875
2012-01-01	31.725
2013-01-01	32.150
2014-01-01	35.175
2015-01-01	37.700
2016-01-01	41.525
2017-01-01	42.425