Year	Percent
1998-01-01	15.300000000000000
1999-01-01	14.700000000000000
2000-01-01	14.700000000000000
2001-01-01	7.200000000000000
2002-01-01	7.200000000000000
2003-01-01	7.200000000000000
2004-01-01	8.300000000000000
2005-01-01	8.200000000000000
2006-01-01	9.400000000000000
2007-01-01	10.500000000000000
2008-01-01	8.900000000000000
2009-01-01	11.500000000000000
2010-01-01	10.824600000000000
2011-01-01	10.072300000000000
2012-01-01	10.048300000000000
2013-01-01	9.304060000000000
2014-01-01	9.191110000000000
2015-01-01	8.532639999999999
2016-01-01	9.173990000000000