Year	Percent
1998-01-01	12.4000000000000000
1999-01-01	14.6000000000000000
2000-01-01	24.0000000000000000
2001-01-01	27.7000000000000000
2002-01-01	14.6000000000000000
2003-01-01	16.1000000000000000
2004-01-01	14.4000000000000000
2005-01-01	10.0000000000000000
2006-01-01	7.5000000000000000
2007-01-01	5.8000000000000000
2008-01-01	4.6000000000000000
2009-01-01	3.5000000000000000
2010-01-01	3.3807400000000003
2011-01-01	2.5554600000000000
2012-01-01	2.2228900000000000
2013-01-01	2.4408700000000000
2014-01-01	2.0246900000000000
2015-01-01	1.8854799999999998
2016-01-01	1.7158500000000000