Year	Percent
2000-01-01	28.6786597031557
2001-01-01	27.9829053875554
2002-01-01	26.1135562755336
2003-01-01	27.2901726573064
2004-01-01	26.1622762586820
2005-01-01	25.4372238556901
2006-01-01	25.0253801952074
2007-01-01	23.1605502922481
2008-01-01	23.7475224591714
2009-01-01	23.5245114290813
2010-01-01	22.3830868921830
2011-01-01	21.1237408572742
2012-01-01	20.4418183043744
2013-01-01	19.6020868188424
2014-01-01	17.9349521537605
2015-01-01	18.1988103092852
2016-01-01	18.2853074327829
2017-01-01	17.2622585767269