Year	Percent
2001-01-01	4.3000000000000000
2002-01-01	3.5000000000000000
2003-01-01	2.8000000000000000
2004-01-01	2.3000000000000000
2005-01-01	1.9000000000000000
2006-01-01	1.9000000000000000
2007-01-01	2.1000000000000000
2008-01-01	2.8000000000000000
2009-01-01	3.7000000000000000
2010-01-01	3.9000000000000000
2011-01-01	3.5701400000000003
2012-01-01	2.8263599999999998
2013-01-01	2.2919800000000000
2014-01-01	2.3074500000000000
2015-01-01	2.2540700000000000
2016-01-01	2.0810900000000000