Year	Percent
1997-01-01	3.4095199999999997
1998-01-01	3.3177199999999996
1999-01-01	3.1158900000000003
2000-01-01	3.6527199999999995
2001-01-01	4.2751300000000000
2002-01-01	4.2751300000000000
2003-01-01	4.2751300000000000
2004-01-01	4.2751300000000000
2005-01-01	4.2751300000000000
2006-01-01	4.2751300000000000
2007-01-01	2.8835300000000000
2008-01-01	2.4682800000000000
2009-01-01	2.7871000000000000
2010-01-01	2.2945200000000000
2011-01-01	1.8684200000000000
2012-01-01	1.7394900000000002
2013-01-01	3.5033100000000000
2014-01-01	9.0642300000000000
2015-01-01	14.4825000000000000
2016-01-01	14.5435000000000000