Year	Percent
1998-01-01	21.6200000000000000
1999-01-01	12.0067000000000000
2000-01-01	14.4978000000000000
2001-01-01	14.4978000000000000
2002-01-01	7.6900000000000000
2003-01-01	7.1600000000000000
2004-01-01	5.9000000000000000
2005-01-01	5.4000000000000000
2006-01-01	4.1800000000000000
2007-01-01	3.0500000000000000
2008-01-01	3.8100000000000000
2009-01-01	4.5300000000000000
2010-01-01	4.9500000000000000
2011-01-01	4.4200000000000000
2012-01-01	3.9856700000000000
2013-01-01	4.2594800000000000
2014-01-01	3.9861199999999997
2015-01-01	3.8794600000000000
2016-01-01	3.5227000000000000