Year	Percent
2000-01-01	9.65
2001-01-01	8.59
2002-01-01	7.10
2003-01-01	9.34
2004-01-01	10.14
2005-01-01	13.67
2006-01-01	17.39
2007-01-01	19.55
2008-01-01	12.31
2009-01-01	18.63
2010-01-01	21.04
2011-01-01	18.97
2012-01-01	20.65
2013-01-01	23.79
2014-01-01	28.97
2015-01-01	30.89
2016-01-01	33.80