Year	Percent
2005-01-01	22.9222394198015
2006-01-01	20.8638500961618
2007-01-01	19.7729885455022
2008-01-01	18.7492354290931
2009-01-01	18.5362631367002
2010-01-01	17.8102581127357
2011-01-01	17.0720553414361
2012-01-01	14.9924466637974
2013-01-01	14.3320884985681
2014-01-01	14.2371581645192
2015-01-01	14.3550322187168
2016-01-01	15.1706199080757
2017-01-01	13.7888671119583