Year	Percent
2007-01-01	1.90
2008-01-01	2.12
2009-01-01	2.54
2010-01-01	2.62
2011-01-01	2.67
2012-01-01	32.36
2013-01-01	30.72
2014-01-01	32.49
2015-01-01	45.14