Year	Percent
1997-01-01	13.7477000000000000
1998-01-01	11.0359000000000000
1999-01-01	10.5541000000000000
2000-01-01	8.1330300000000000
2001-01-01	7.1429000000000000
2002-01-01	5.0398600000000000
2003-01-01	6.3113900000000000
2004-01-01	7.4240600000000010
2005-01-01	9.1881899999999990
2006-01-01	8.8598900000000000
2007-01-01	8.4861000000000000
2008-01-01	8.3402600000000000
2009-01-01	5.8361000000000000
2010-01-01	6.9200800000000005
2011-01-01	6.9672300000000010
2012-01-01	6.4419400000000000
2013-01-01	6.1166700000000000
2014-01-01	4.9364099999999995
2015-01-01	4.5419000000000000
2016-01-01	4.1208800000000005