Year	Percent
1998-01-01	4.6000000000000000
1999-01-01	6.6000000000000000
2000-01-01	10.3000000000000000
2001-01-01	16.2000000000000000
2002-01-01	17.7000000000000000
2003-01-01	16.7000000000000000
2004-01-01	14.0000000000000000
2005-01-01	11.3000000000000000
2006-01-01	8.7000000000000000
2007-01-01	5.6000000000000000
2008-01-01	4.3000000000000000
2009-01-01	3.5000000000000000
2010-01-01	2.1970200000000000
2011-01-01	1.6534900000000001
2012-01-01	1.5000000000000000
2013-01-01	1.5000000000000000
2014-01-01	1.5000000000000000
2015-01-01	1.6000000000000000