Year	Percent
1997-01-01	3.9626800000000000
1998-01-01	2.7605600000000000
1999-01-01	2.0396400000000003
2000-01-01	0.3025870000000000
2001-01-01	0.4984640000000000
2002-01-01	2.5520099999999997
2003-01-01	2.4028800000000000
2004-01-01	3.5994900000000003
2005-01-01	2.8558100000000000
2006-01-01	3.9816800000000003
2007-01-01	3.3559800000000000
2008-01-01	3.0315000000000000
2009-01-01	0.8831200000000001
2010-01-01	2.0317000000000000
2011-01-01	1.8648400000000000
2012-01-01	1.7582000000000000
2013-01-01	1.4980700000000000
2014-01-01	0.9363430000000000
2015-01-01	0.2952020000000000
2016-01-01	1.1986800000000000