Year	Percent
1997-01-01	4.9751199999999995
1998-01-01	4.9751199999999995
1999-01-01	4.9751199999999995
2000-01-01	5.2350400000000010
2001-01-01	5.3890699999999990
2002-01-01	6.7155000000000000
2003-01-01	8.3203800000000000
2004-01-01	9.6472800000000000
2005-01-01	9.6470600000000000
2006-01-01	9.6563500000000000
2007-01-01	10.8037000000000000
2008-01-01	8.8558200000000000
2009-01-01	6.9232500000000000
2010-01-01	8.8847500000000000
2011-01-01	8.3889600000000000
2012-01-01	6.7799900000000000
2013-01-01	9.4466800000000000
2014-01-01	6.8082000000000000
2015-01-01	5.9177800000000005
2016-01-01	5.4215700000000000