Year	Percent
1996-01-01	2.9228099999999997
1997-01-01	3.4670900000000002
1998-01-01	3.1143900000000000
1999-01-01	3.0575799999999997
2000-01-01	4.6775000000000000
2001-01-01	6.7198699999999990
2002-01-01	3.8872500000000000
2003-01-01	3.5171900000000003
2004-01-01	3.1603900000000000
2005-01-01	2.8703700000000000
2006-01-01	2.6360900000000003
2007-01-01	2.6884099999999997
2008-01-01	2.2317200000000000
2009-01-01	2.1560500000000000
2010-01-01	2.2875500000000000
2011-01-01	2.1927500000000000
2012-01-01	2.4036800000000000
2013-01-01	2.2888599999999997
2014-01-01	2.1983000000000000
2015-01-01	2.0905900000000000
2016-01-01	2.1322300000000000