Year	Percent
1999-01-01	40.075
2000-01-01	38.325
2001-01-01	34.625
2002-01-01	32.625
2003-01-01	30.950
2004-01-01	27.950
2005-01-01	27.075
2006-01-01	26.700
2007-01-01	25.725
2008-01-01	25.125
2009-01-01	24.675
2010-01-01	24.825
2011-01-01	24.300
2012-01-01	25.675
2013-01-01	27.425
2014-01-01	29.525
2015-01-01	31.050
2016-01-01	32.300
2017-01-01	32.450