Year	Percent
2000-01-01	33.6364900557112
2001-01-01	35.1164588049229
2002-01-01	36.4918883846311
2003-01-01	36.0427513084095
2004-01-01	36.4041828021950
2005-01-01	35.7129801314485
2006-01-01	32.7165375862301
2007-01-01	30.7886155393263
2008-01-01	28.5255887036114
2009-01-01	27.0829376727701
2010-01-01	27.4550314645602
2011-01-01	27.3644054991686
2012-01-01	28.1092643407617
2013-01-01	27.5998327384029
2014-01-01	29.3258455035464
2015-01-01	30.4255414893897
2016-01-01	30.6903441993333
2017-01-01	30.9302784666487