Year	Percent
1998-01-01	8.1000000000000000
1999-01-01	9.3000000000000000
2000-01-01	9.3000000000000000
2001-01-01	16.5000000000000000
2002-01-01	19.7000000000000000
2003-01-01	20.6000000000000000
2004-01-01	10.8000000000000000
2005-01-01	6.5000000000000000
2006-01-01	3.3000000000000000
2007-01-01	1.3000000000000000
2008-01-01	1.1000000000000000
2009-01-01	1.6000000000000000
2010-01-01	1.4394200000000001
2011-01-01	1.8645400000000000
2012-01-01	2.2168900000000002
2013-01-01	2.1315000000000000
2014-01-01	1.9904700000000002
2015-01-01	2.5938000000000000
2016-01-01	2.9414000000000000