Year	Percent
1998-01-01	6.6000000000000000
1999-01-01	6.4000000000000000
2000-01-01	8.5000000000000000
2001-01-01	8.1000000000000000
2002-01-01	8.2000000000000000
2003-01-01	7.3000000000000000
2004-01-01	6.7000000000000000
2005-01-01	6.3000000000000000
2006-01-01	6.4000000000000000
2007-01-01	6.7000000000000000
2008-01-01	5.9000000000000000
2009-01-01	6.4000000000000000
2010-01-01	6.0946000000000000
2011-01-01	5.9238000000000000
2012-01-01	5.7565000000000000
2013-01-01	6.7916200000000000
2014-01-01	7.2416100000000005
2015-01-01	7.4430100000000010
2016-01-01	7.7888000000000000