Year	Percent
1999-01-01	26.575
2000-01-01	26.250
2001-01-01	26.825
2002-01-01	26.825
2003-01-01	27.125
2004-01-01	26.600
2005-01-01	26.100
2006-01-01	26.600
2007-01-01	26.350
2008-01-01	26.675
2009-01-01	27.175
2010-01-01	26.550
2011-01-01	27.700
2012-01-01	27.525
2013-01-01	27.275
2014-01-01	27.550
2015-01-01	27.825
2016-01-01	27.650
2017-01-01	27.250