Year	Percent
1997-01-01	8.9513400000000000
1998-01-01	8.8041000000000000
1999-01-01	6.0309099999999995
2000-01-01	9.9264500000000000
2001-01-01	12.0474000000000000
2002-01-01	10.9031000000000000
2003-01-01	11.3740000000000000
2004-01-01	9.3922800000000000
2005-01-01	6.5859300000000000
2006-01-01	4.6943699999999990
2007-01-01	3.9818700000000000
2008-01-01	3.5755000000000000
2009-01-01	4.9689900000000000
2010-01-01	7.7286300000000000
2011-01-01	4.3974600000000000
2012-01-01	6.3911000000000000
2013-01-01	6.7732399999999995
2014-01-01	6.3342500000000000
2015-01-01	4.2810800000000000
2016-01-01	6.4193500000000000