Year	Percent
2004-01-01	2.87
2005-01-01	2.72
2006-01-01	2.60
2007-01-01	3.90
2008-01-01	3.56
2009-01-01	3.76
2010-01-01	3.69
2011-01-01	4.12
2012-01-01	4.48
2013-01-01	4.61
2014-01-01	5.42
2015-01-01	6.78
2016-01-01	7.14