Year	Percent
2000-01-01	1.28
2001-01-01	2.49
2002-01-01	3.91
2003-01-01	5.33
2004-01-01	6.80
2005-01-01	8.80
2006-01-01	11.03
2007-01-01	11.80
2008-01-01	10.91
2009-01-01	13.15
2010-01-01	15.32
2011-01-01	14.54
2012-01-01	16.77
2013-01-01	18.20
2014-01-01	8.74
2015-01-01	7.93
2016-01-01	8.41