Year	Percent
2000-01-01	40.600
2001-01-01	38.350
2002-01-01	37.500
2003-01-01	37.025
2004-01-01	38.825
2005-01-01	39.125
2006-01-01	37.850
2007-01-01	35.500
2008-01-01	35.275
2009-01-01	35.000
2010-01-01	34.450
2011-01-01	33.150
2012-01-01	32.500
2013-01-01	32.100
2014-01-01	30.800
2015-01-01	30.200
2016-01-01	29.675
2017-01-01	30.625