Year	Percent
1999-01-01	2.17
2000-01-01	2.20
2001-01-01	2.25
2002-01-01	2.40
2003-01-01	2.20
2004-01-01	2.32
2005-01-01	2.63
2006-01-01	3.30
2007-01-01	3.41
2008-01-01	3.50
2009-01-01	3.82
2010-01-01	3.91
2011-01-01	3.68
2012-01-01	3.78
2013-01-01	4.00
2014-01-01	4.23
2015-01-01	4.31
2016-01-01	4.27