Year	Percent
2000-01-01	19.69
2001-01-01	22.41
2002-01-01	24.55
2003-01-01	17.88
2004-01-01	23.20
2005-01-01	22.16
2006-01-01	24.90
2007-01-01	29.39
2008-01-01	22.15
2009-01-01	29.33
2010-01-01	24.35
2011-01-01	18.85
2012-01-01	21.88
2013-01-01	21.84
2014-01-01	23.39
2015-01-01	24.83
2016-01-01	26.26