Year	Percent
1998-01-01	1.5341100000000000
1999-01-01	1.3445600000000000
2000-01-01	1.7242000000000000
2001-01-01	1.7709000000000000
2002-01-01	1.6962800000000000
2003-01-01	1.7087299999999999
2004-01-01	2.2941800000000000
2005-01-01	1.8647900000000002
2006-01-01	2.0227700000000000
2007-01-01	2.0144300000000000
2008-01-01	2.3941300000000000
2009-01-01	2.5334500000000000
2010-01-01	1.7952200000000000
2011-01-01	1.8776800000000000
2012-01-01	1.6405700000000000
2013-01-01	1.4389399999999999
2014-01-01	1.4838900000000000
2015-01-01	1.5880100000000001
2016-01-01	1.4636400000000000