Year	Percent
2000-01-01	2.50
2001-01-01	3.03
2002-01-01	4.20
2003-01-01	3.87
2004-01-01	3.60
2005-01-01	3.59
2006-01-01	3.74
2007-01-01	3.65
2008-01-01	3.72
2009-01-01	3.92
2010-01-01	4.05
2011-01-01	4.42
2012-01-01	4.88
2013-01-01	5.30
2014-01-01	5.85
2015-01-01	6.64
2016-01-01	7.33