Year	Percent
2005-01-01	30.200
2006-01-01	30.000
2007-01-01	29.850
2008-01-01	29.700
2009-01-01	30.025
2010-01-01	30.250
2011-01-01	30.325
2012-01-01	30.150
2013-01-01	30.350
2014-01-01	30.525
2015-01-01	30.525
2016-01-01	30.300
2017-01-01	30.225