Year	Percent
1997-01-01	6.6666700000000000
1998-01-01	6.6666700000000000
1999-01-01	6.6666700000000000
2000-01-01	6.6666700000000000
2001-01-01	5.9259300000000000
2002-01-01	4.2639600000000000
2003-01-01	3.6139300000000003
2004-01-01	3.5985600000000000
2005-01-01	4.1981000000000000
2006-01-01	3.8177300000000005
2007-01-01	4.4324600000000000
2008-01-01	4.9376700000000000
2009-01-01	3.2986100000000000
2010-01-01	3.1496100000000000
2011-01-01	6.1780100000000000
2012-01-01	4.9441800000000000
2013-01-01	5.3767500000000000
2014-01-01	4.9019600000000000
2015-01-01	5.2231200000000000
2016-01-01	4.2170400000000000