Year	Percent
1998-01-01	3.700000000000000
1999-01-01	2.000000000000000
2000-01-01	8.500000000000000
2001-01-01	9.100000000000000
2002-01-01	8.700000000000000
2003-01-01	8.400000000000000
2004-01-01	8.000000000000000
2005-01-01	7.600000000000000
2006-01-01	7.600000000000000
2007-01-01	7.900000000000000
2008-01-01	7.700000000000000
2009-01-01	7.700000000000000
2010-01-01	9.274090000000000
2011-01-01	9.926130000000000
2012-01-01	10.483800000000000
2013-01-01	11.303800000000000
2014-01-01	10.074400000000000
2015-01-01	10.063300000000000
2016-01-01	9.955210000000001