Year	Percent
1998-01-01	6.3000000000000000
1999-01-01	5.7000000000000000
2000-01-01	5.0000000000000000
2001-01-01	4.1000000000000000
2002-01-01	5.0000000000000000
2003-01-01	4.8000000000000000
2004-01-01	4.2000000000000000
2005-01-01	3.5000000000000000
2006-01-01	3.0000000000000000
2007-01-01	2.7000000000000000
2008-01-01	2.8000000000000000
2009-01-01	4.0000000000000000
2010-01-01	3.7585699999999997
2011-01-01	4.2914500000000000
2012-01-01	4.2945199999999994
2013-01-01	4.4954300000000010
2014-01-01	4.1625000000000000
2015-01-01	3.9829100000000000
2016-01-01	3.9096900000000003