Year	Percent
1998-01-01	19.4000000000000000
1999-01-01	25.6000000000000000
2000-01-01	22.6000000000000000
2001-01-01	19.7000000000000000
2002-01-01	21.4000000000000000
2003-01-01	20.5000000000000000
2004-01-01	21.6000000000000000
2005-01-01	21.6000000000000000
2006-01-01	9.3000000000000000
2007-01-01	9.5000000000000000
2008-01-01	6.3000000000000000
2009-01-01	37.3000000000000000
2010-01-01	20.1431000000000000
2011-01-01	5.7716300000000000
2012-01-01	3.7052300000000002
2013-01-01	3.3933900000000000
2014-01-01	2.9595400000000000
2015-01-01	4.8608900000000000
2016-01-01	12.8151000000000000