Year	Percent
2000-01-01	2.55
2001-01-01	3.64
2002-01-01	4.44
2003-01-01	5.22
2004-01-01	5.50
2005-01-01	6.22
2006-01-01	6.87
2007-01-01	7.29
2008-01-01	7.65
2009-01-01	9.52
2010-01-01	10.43
2011-01-01	10.76
2012-01-01	12.18
2013-01-01	12.72
2014-01-01	13.75
2015-01-01	13.91
2016-01-01	14.09