Year	Percent
2007-01-01	35.2770
2008-01-01	29.7189
2009-01-01	24.9042
2010-01-01	19.3355
2011-01-01	20.6676
2012-01-01	30.4010
2013-01-01	24.5579
2014-01-01	34.7078
2015-01-01	36.0186
2016-01-01	22.0130