Year	Percent
1998-01-01	7.000000000000000
1999-01-01	7.100000000000000
2000-01-01	7.100000000000000
2001-01-01	8.000000000000000
2002-01-01	8.700000000000000
2003-01-01	8.300000000000000
2004-01-01	8.000000000000000
2005-01-01	7.900000000000000
2006-01-01	7.800000000000000
2007-01-01	8.000000000000000
2008-01-01	7.500000000000000
2009-01-01	8.100000000000000
2010-01-01	8.198480000000000
2011-01-01	7.818020000000000
2012-01-01	8.693430000000001
2013-01-01	9.098189999999999
2014-01-01	8.937970000000000
2015-01-01	9.369700000000000
2016-01-01	9.506620000000000