Year	Percent
1998-01-01	9.800000000000000
1999-01-01	8.700000000000000
2000-01-01	4.600000000000000
2001-01-01	11.100000000000000
2002-01-01	7.700000000000000
2003-01-01	8.900000000000000
2004-01-01	7.700000000000000
2005-01-01	7.400000000000000
2006-01-01	7.000000000000000
2007-01-01	8.000000000000000
2008-01-01	8.200000000000000
2009-01-01	9.600000000000000
2010-01-01	9.716640000000000
2011-01-01	10.750700000000000
2012-01-01	11.687000000000001
2013-01-01	12.116700000000000
2014-01-01	11.863800000000000
2015-01-01	11.122400000000000
2016-01-01	10.977100000000000