Year	Percent
1999-01-01	38.050
2000-01-01	38.000
2001-01-01	37.475
2002-01-01	36.250
2003-01-01	35.700
2004-01-01	36.500
2005-01-01	35.100
2006-01-01	34.025
2007-01-01	32.925
2008-01-01	32.175
2009-01-01	31.275
2010-01-01	31.100
2011-01-01	30.750
2012-01-01	29.975
2013-01-01	29.350
2014-01-01	29.200
2015-01-01	29.100
2016-01-01	28.325
2017-01-01	28.175