Year	Percent
1999-01-01	32.700
2000-01-01	32.525
2001-01-01	31.900
2002-01-01	32.200
2003-01-01	32.875
2004-01-01	30.225
2005-01-01	29.350
2006-01-01	29.125
2007-01-01	28.700
2008-01-01	28.200
2009-01-01	28.150
2010-01-01	28.500
2011-01-01	29.725
2012-01-01	29.600
2013-01-01	29.475
2014-01-01	29.125
2015-01-01	28.250
2016-01-01	28.350
2017-01-01	25.775