Year	Percent
1997-01-01	6.7279100000000005
1998-01-01	6.7279100000000005
1999-01-01	6.7279100000000005
2000-01-01	6.8468600000000000
2001-01-01	7.0995500000000000
2002-01-01	8.6506300000000000
2003-01-01	10.2221000000000000
2004-01-01	11.4194000000000000
2005-01-01	12.7070000000000000
2006-01-01	11.3964000000000000
2007-01-01	9.2262800000000010
2008-01-01	8.7809400000000000
2009-01-01	6.4708000000000000
2010-01-01	8.6148600000000000
2011-01-01	7.6940100000000005
2012-01-01	5.5448000000000000
2013-01-01	11.1634000000000000
2014-01-01	9.3760500000000000
2015-01-01	10.3548000000000000
2016-01-01	9.5675900000000000