Year	Percent
1996-01-01	3.6047800000000003
1997-01-01	3.2703400000000000
1998-01-01	2.4628700000000000
1999-01-01	1.9129500000000000
2000-01-01	2.2763600000000000
2001-01-01	2.7310200000000000
2002-01-01	2.7662200000000000
2003-01-01	2.6195700000000000
2004-01-01	3.6140700000000000
2005-01-01	2.5135800000000000
2006-01-01	1.5231000000000000
2007-01-01	1.9048500000000000
2008-01-01	2.2903100000000000
2009-01-01	2.5877100000000000
2010-01-01	2.8361200000000000
2011-01-01	4.9365100000000000
2012-01-01	2.8767900000000000
2013-01-01	2.5233800000000000
2014-01-01	2.4490600000000000
2015-01-01	1.8037299999999998
2016-01-01	1.9270700000000000