Year	Percent
2002-01-01	11.95
2003-01-01	13.04
2004-01-01	16.43
2005-01-01	22.40
2006-01-01	21.57
2007-01-01	21.57
2008-01-01	21.57
2009-01-01	26.68
2010-01-01	27.99
2011-01-01	29.88
2012-01-01	36.27
2013-01-01	34.44
2014-01-01	34.74
2015-01-01	36.66
2016-01-01	39.93