Year	Percent
1997-01-01	8.0899200000000000
1998-01-01	10.3195000000000000
1999-01-01	12.8855000000000000
2000-01-01	6.7353399999999990
2001-01-01	6.7911000000000000
2002-01-01	6.6650800000000010
2003-01-01	6.2249099999999995
2004-01-01	6.9963899999999990
2005-01-01	6.9570399999999990
2006-01-01	8.0996200000000000
2007-01-01	8.6805899999999990
2008-01-01	8.3237000000000000
2009-01-01	10.3245000000000000
2010-01-01	10.1725000000000000
2011-01-01	10.7192000000000000
2012-01-01	11.1704000000000000
2013-01-01	12.0525000000000000
2014-01-01	12.0325000000000000
2015-01-01	10.4244000000000000
2016-01-01	10.5772000000000000
2017-01-01	11.8340000000000010