Year	Percent
1998-01-01	12.200000000000000
1999-01-01	11.900000000000000
2000-01-01	11.800000000000000
2001-01-01	12.500000000000000
2002-01-01	12.000000000000000
2003-01-01	12.000000000000000
2004-01-01	6.400000000000000
2005-01-01	6.400000000000000
2006-01-01	6.400000000000000
2007-01-01	10.300000000000000
2008-01-01	10.400000000000000
2009-01-01	12.600000000000000
2010-01-01	13.296700000000000
2011-01-01	13.747300000000000
2012-01-01	14.773100000000000
2013-01-01	14.716900000000000
2014-01-01	14.324800000000000
2015-01-01	14.529200000000000
2016-01-01	13.174000000000001