Year	Percent
2002-01-01	3.677740000000000
2003-01-01	2.646790000000000
2004-01-01	2.456260000000000
2005-01-01	2.682950000000000
2006-01-01	3.316350000000000
2007-01-01	3.678560000000000
2008-01-01	4.412420000000000
2009-01-01	4.519010000000000
2010-01-01	5.320380000000000
2011-01-01	5.825419999999999
2012-01-01	7.006700000000000
2013-01-01	7.412280000000000
2014-01-01	7.645600000000000
2015-01-01	6.602680000000000
2016-01-01	5.805060000000000
2017-01-01	5.970760000000000