Year	Percent
1998-01-01	6.0000000000000000
1999-01-01	8.0000000000000000
2000-01-01	17.5000000000000000
2001-01-01	17.5000000000000000
2002-01-01	9.9000000000000000
2003-01-01	5.4000000000000000
2004-01-01	2.1000000000000000
2005-01-01	1.9000000000000000
2006-01-01	2.4000000000000000
2007-01-01	2.4000000000000000
2008-01-01	4.3000000000000000
2009-01-01	4.9000000000000000
2010-01-01	3.0414100000000000
2011-01-01	3.4210900000000000
2012-01-01	3.6692199999999997
2013-01-01	4.4853400000000000
2014-01-01	6.9697500000000000
2015-01-01	7.9497200000000000
2016-01-01	6.7241100000000005