Year	Percent
1998-01-01	7.50000
1999-01-01	7.80000
2000-01-01	7.50000
2001-01-01	7.20000
2002-01-01	7.20000
2003-01-01	7.30000
2004-01-01	7.00000
2005-01-01	7.10000
2006-01-01	6.80000
2007-01-01	7.10000
2008-01-01	6.40000
2009-01-01	6.80000
2010-01-01	8.28474
2011-01-01	7.77135
2012-01-01	8.00648
2013-01-01	8.12636
2014-01-01	7.97112
2015-01-01	7.57499
2016-01-01	8.41033