Year	Percent
2000-01-01	2.27
2001-01-01	2.45
2002-01-01	2.52
2003-01-01	2.50
2004-01-01	3.25
2005-01-01	3.77
2006-01-01	9.79
2007-01-01	11.85
2008-01-01	9.82
2009-01-01	13.33
2010-01-01	14.07
2011-01-01	13.52
2012-01-01	13.95
2013-01-01	13.88
2014-01-01	14.52
2015-01-01	17.50
2016-01-01	17.90