Year	Percent
2004-01-01	0.12
2005-01-01	0.12
2006-01-01	0.12
2007-01-01	0.12
2008-01-01	0.12
2009-01-01	0.12
2010-01-01	0.12
2011-01-01	0.12
2012-01-01	0.14
2013-01-01	0.19
2014-01-01	0.19
2015-01-01	0.27
2016-01-01	0.21