Year	Percent
1998-01-01	8.1000000000000000
1999-01-01	26.0000000000000000
2000-01-01	31.0000000000000000
2001-01-01	13.4000000000000000
2002-01-01	8.4000000000000000
2003-01-01	7.9000000000000000
2004-01-01	6.4000000000000000
2005-01-01	5.5000000000000000
2006-01-01	4.1000000000000000
2007-01-01	3.7000000000000000
2008-01-01	3.4000000000000000
2009-01-01	4.1000000000000000
2010-01-01	3.3546000000000000
2011-01-01	3.1977300000000000
2012-01-01	3.7560200000000000
2013-01-01	3.5571500000000000
2014-01-01	3.5837100000000000
2015-01-01	4.4040599999999990
2016-01-01	3.9643300000000004