Year	Percent
1998-01-01	8.200000000000000
1999-01-01	8.400000000000000
2000-01-01	8.500000000000000
2001-01-01	8.300000000000000
2002-01-01	8.700000000000000
2003-01-01	8.500000000000000
2004-01-01	8.200000000000000
2005-01-01	7.700000000000000
2006-01-01	7.600000000000000
2007-01-01	7.400000000000000
2008-01-01	8.100000000000000
2009-01-01	9.000000000000000
2010-01-01	9.384240000000000
2011-01-01	8.893310000000001
2012-01-01	9.385940000000000
2013-01-01	9.593770000000000
2014-01-01	9.951690000000000
2015-01-01	10.459100000000000
2016-01-01	11.003400000000000