Year	Percent
2000-01-01	29.750
2001-01-01	30.025
2002-01-01	30.225
2003-01-01	30.100
2004-01-01	30.375
2005-01-01	30.425
2006-01-01	30.125
2007-01-01	30.175
2008-01-01	30.050
2009-01-01	30.650
2010-01-01	31.000
2011-01-01	31.200
2012-01-01	31.125
2013-01-01	31.225
2014-01-01	31.425
2015-01-01	31.450
2016-01-01	31.400
2017-01-01	31.750