Year	Percent
1998-01-01	11.100000000000000
1999-01-01	10.800000000000000
2000-01-01	9.200000000000000
2001-01-01	9.500000000000000
2002-01-01	9.800000000000000
2003-01-01	10.000000000000000
2004-01-01	10.400000000000000
2005-01-01	12.500000000000000
2006-01-01	11.800000000000000
2007-01-01	10.500000000000000
2008-01-01	9.400000000000000
2009-01-01	10.500000000000000
2010-01-01	10.332100000000000
2011-01-01	9.798960000000001
2012-01-01	12.637500000000000
2013-01-01	13.309700000000000
2014-01-01	12.367100000000000
2015-01-01	13.500400000000000
2016-01-01	12.525500000000000