Year	Percent
1998-01-01	6.7000000000000000
1999-01-01	6.8000000000000000
2000-01-01	7.3000000000000000
2001-01-01	4.9000000000000000
2002-01-01	4.9000000000000000
2003-01-01	5.3000000000000000
2004-01-01	5.5000000000000000
2005-01-01	5.6000000000000000
2006-01-01	5.9000000000000000
2007-01-01	9.0000000000000000
2008-01-01	9.1000000000000000
2009-01-01	6.5000000000000000
2010-01-01	6.6966399999999995
2011-01-01	6.3336200000000000
2012-01-01	6.6199200000000000
2013-01-01	6.9765500000000000
2014-01-01	7.0993500000000000
2015-01-01	7.0580000000000000
2016-01-01	7.2185700000000000