Year	Percent
1998-01-01	6.0000000000000000
1999-01-01	6.0000000000000000
2000-01-01	4.6000000000000000
2001-01-01	2.8000000000000000
2002-01-01	2.0000000000000000
2003-01-01	1.4000000000000000
2004-01-01	1.1000000000000000
2005-01-01	0.7000000000000000
2006-01-01	0.5000000000000000
2007-01-01	0.8000000000000000
2008-01-01	2.1000000000000000
2009-01-01	14.3000000000000000
2010-01-01	15.9340000000000010
2011-01-01	14.0548000000000000
2012-01-01	8.7237900000000000
2013-01-01	6.4070400000000000
2014-01-01	4.5977400000000000
2015-01-01	4.6446500000000000
2016-01-01	3.6519800000000004