Year	Percent
2000-01-01	19.79
2001-01-01	20.53
2002-01-01	22.48
2003-01-01	22.71
2004-01-01	25.78
2005-01-01	28.43
2006-01-01	33.79
2007-01-01	32.58
2008-01-01	18.45
2009-01-01	25.84
2010-01-01	27.89
2011-01-01	24.68
2012-01-01	31.64
2013-01-01	34.55
2014-01-01	34.23
2015-01-01	39.76
2016-01-01	42.26