Year	Percent
1996-01-01	6.1775800000000000
1997-01-01	5.5122800000000005
1998-01-01	5.9755000000000000
1999-01-01	5.4887700000000000
2000-01-01	6.8380800000000010
2001-01-01	5.9044800000000000
2002-01-01	5.3829000000000000
2003-01-01	5.9957900000000000
2004-01-01	6.6858100000000010
2005-01-01	5.5683300000000004
2006-01-01	6.4729900000000000
2007-01-01	6.2690500000000000
2008-01-01	6.8754100000000005
2009-01-01	5.8684100000000000
2010-01-01	4.1694900000000010
2011-01-01	4.2623400000000000
2012-01-01	4.8359900000000000
2013-01-01	4.7210800000000010
2014-01-01	3.3671699999999998
2015-01-01	3.8716100000000000
2016-01-01	2.7213500000000000