Year	Percent
2004-01-01	10.76
2005-01-01	10.76
2006-01-01	14.31
2007-01-01	14.75
2008-01-01	15.52
2009-01-01	4.59
2010-01-01	17.44
2011-01-01	17.66
2012-01-01	17.93
2013-01-01	18.35
2014-01-01	19.37
2015-01-01	19.98