Year	Percent
1997-01-01	5.9989099999999995
1998-01-01	6.4215400000000000
1999-01-01	6.0393900000000000
2000-01-01	5.9104100000000000
2001-01-01	6.1032000000000000
2002-01-01	5.5327400000000000
2003-01-01	4.2529000000000000
2004-01-01	3.6053400000000000
2005-01-01	5.8910599999999995
2006-01-01	5.4849700000000000
2007-01-01	4.4846500000000000
2008-01-01	3.5557800000000004
2009-01-01	6.2098400000000000
2010-01-01	5.4262300000000000
2011-01-01	4.3938100000000000
2012-01-01	4.3335400000000000
2013-01-01	1.9099300000000000
2014-01-01	6.9522900000000000
2015-01-01	8.3484000000000000
2016-01-01	11.9903000000000000