Year	Percent
2004-01-01	12.04
2005-01-01	13.02
2006-01-01	14.76
2007-01-01	15.09
2008-01-01	17.39
2009-01-01	15.98
2010-01-01	18.28
2011-01-01	19.07
2012-01-01	18.21
2013-01-01	16.63
2014-01-01	16.85