Year	Percent
2002-01-01	1.39
2003-01-01	1.45
2004-01-01	1.51
2005-01-01	1.63
2006-01-01	6.80
2007-01-01	6.84
2008-01-01	7.11
2009-01-01	8.68
2010-01-01	14.23
2011-01-01	16.51
2012-01-01	19.60
2013-01-01	21.69
2014-01-01	24.22
2015-01-01	25.57
2016-01-01	26.87