Year	Percent
2000-01-01	2.33107211818513
2001-01-01	1.81291505092996
2002-01-01	2.46176472510964
2003-01-01	3.51760890104704
2004-01-01	4.32917046647142
2005-01-01	4.44355854794604
2006-01-01	3.53155240398761
2007-01-01	2.79898729092764
2008-01-01	2.53435663804218
2009-01-01	3.36863706956712
2010-01-01	4.39853502819819
2011-01-01	4.60145252753285
2012-01-01	5.46906685158783
2013-01-01	7.19236698830224
2014-01-01	7.13491865943433
2015-01-01	6.52561079476077
2016-01-01	5.57346753173275
2017-01-01	4.47764725311284