Year	Percent
1998-01-01	16.200000000000000
1999-01-01	15.500000000000000
2000-01-01	12.600000000000000
2001-01-01	13.300000000000000
2002-01-01	12.100000000000000
2003-01-01	10.500000000000000
2004-01-01	9.900000000000000
2005-01-01	8.600000000000000
2006-01-01	8.400000000000000
2007-01-01	8.600000000000000
2008-01-01	8.200000000000000
2009-01-01	8.700000000000000
2010-01-01	9.282080000000000
2011-01-01	8.924610000000001
2012-01-01	9.883830000000000
2013-01-01	11.258400000000000
2014-01-01	11.595400000000000
2015-01-01	10.754000000000001
2016-01-01	10.826100000000000