Year	Percent
1997-01-01	0.7861739999999999
1998-01-01	2.7270800000000000
1999-01-01	3.5993300000000000
2000-01-01	8.3622000000000000
2001-01-01	4.9766900000000005
2002-01-01	5.2886400000000000
2003-01-01	5.9658400000000000
2004-01-01	5.7011699999999990
2005-01-01	4.8469100000000000
2006-01-01	4.8454200000000000
2007-01-01	4.1103900000000000
2008-01-01	3.2479299999999998
2009-01-01	4.8297700000000000
2010-01-01	6.5091100000000000
2011-01-01	7.0716600000000005
2012-01-01	9.2949600000000010
2013-01-01	11.1799000000000000
2014-01-01	13.6636000000000000
2015-01-01	2.8239500000000000
2016-01-01	3.7823800000000003