Year	Percent
1998-01-01	19.954300000000000
1999-01-01	20.485300000000000
2000-01-01	16.200000000000000
2001-01-01	13.700000000000000
2002-01-01	13.684400000000000
2003-01-01	15.632200000000000
2004-01-01	15.699000000000002
2005-01-01	18.345400000000000
2006-01-01	19.389700000000000
2007-01-01	22.533100000000000
2008-01-01	18.754200000000000
2009-01-01	22.688400000000000
2010-01-01	22.310200000000000
2011-01-01	12.003200000000000
2012-01-01	15.381400000000000
2013-01-01	7.814630000000000
2014-01-01	9.617100000000000
2015-01-01	8.950439999999999
2016-01-01	9.052430000000001