Year	Percent
1998-01-01	11.289900000000000
1999-01-01	10.561700000000000
2000-01-01	10.007200000000000
2001-01-01	12.069800000000000
2002-01-01	12.143300000000000
2003-01-01	10.489900000000000
2004-01-01	11.800600000000000
2005-01-01	14.326900000000000
2006-01-01	13.551700000000000
2007-01-01	18.516800000000000
2008-01-01	17.530100000000000
2009-01-01	11.883400000000000
2010-01-01	11.097000000000001
2011-01-01	12.266500000000000
2012-01-01	12.005000000000000
2013-01-01	13.751200000000000
2014-01-01	17.427100000000000
2015-01-01	19.896800000000000
2016-01-01	18.317600000000000