Year	Percent
1999-01-01	34.000
2000-01-01	32.750
2001-01-01	30.550
2002-01-01	30.525
2003-01-01	29.100
2004-01-01	33.850
2005-01-01	34.025
2006-01-01	34.975
2007-01-01	37.625
2008-01-01	38.400
2009-01-01	35.275
2010-01-01	34.075
2011-01-01	31.550
2012-01-01	27.325
2013-01-01	26.575
2014-01-01	26.800
2015-01-01	29.575
2016-01-01	28.625
2017-01-01	34.750