Year	Percent
1998-01-01	10.2000000000000000
1999-01-01	8.7000000000000000
2000-01-01	8.3000000000000000
2001-01-01	5.6000000000000000
2002-01-01	4.5000000000000000
2003-01-01	4.1000000000000000
2004-01-01	2.9000000000000000
2005-01-01	3.5000000000000000
2006-01-01	3.5000000000000000
2007-01-01	3.0000000000000000
2008-01-01	3.1000000000000000
2009-01-01	4.2000000000000000
2010-01-01	3.1077200000000000
2011-01-01	3.4668600000000000
2012-01-01	3.4468199999999998
2013-01-01	2.8572800000000000
2014-01-01	2.8548000000000000
2015-01-01	3.3117900000000002
2016-01-01	3.9166400000000000