Year	Percent
1998-01-01	4.40000
1999-01-01	4.30000
2000-01-01	6.00000
2001-01-01	5.60000
2002-01-01	5.50000
2003-01-01	5.70000
2004-01-01	5.30000
2005-01-01	5.10000
2006-01-01	4.90000
2007-01-01	4.60000
2008-01-01	4.80000
2009-01-01	5.60000
2010-01-01	5.40141
2011-01-01	5.54787
2012-01-01	5.50258
2013-01-01	5.68539
2014-01-01	6.33211
2015-01-01	6.87593
2016-01-01	6.74489