Year	Percent
2000-01-01	34.375
2001-01-01	31.350
2002-01-01	27.775
2003-01-01	32.375
2004-01-01	29.525
2005-01-01	31.075
2006-01-01	30.350
2007-01-01	32.100
2008-01-01	37.075
2009-01-01	34.100
2010-01-01	34.250
2011-01-01	36.500
2012-01-01	37.225
2013-01-01	38.200
2014-01-01	37.000
2015-01-01	37.675
2016-01-01	40.375
2017-01-01	42.425