Year	Percent
1998-01-01	6.7000000000000000
1999-01-01	10.5000000000000000
2000-01-01	9.2000000000000000
2001-01-01	29.3000000000000000
2002-01-01	12.7000000000000000
2003-01-01	11.5000000000000000
2004-01-01	6.5000000000000000
2005-01-01	5.0000000000000000
2006-01-01	3.9000000000000000
2007-01-01	3.3000000000000000
2008-01-01	3.4000000000000000
2009-01-01	5.0000000000000000
2010-01-01	3.4895900000000000
2011-01-01	2.5763200000000000
2012-01-01	2.7433700000000000
2013-01-01	2.6362700000000000
2014-01-01	2.7418299999999998
2015-01-01	2.9877200000000000
2016-01-01	3.1096800000000000