Year	Percent
1998-01-01	48.6000000000000000
1999-01-01	32.9000000000000000
2000-01-01	34.4000000000000000
2001-01-01	31.9000000000000000
2002-01-01	24.0000000000000000
2003-01-01	6.8000000000000000
2004-01-01	4.5000000000000000
2005-01-01	7.6000000000000000
2006-01-01	6.1000000000000000
2007-01-01	4.0000000000000000
2008-01-01	3.2000000000000000
2009-01-01	3.3000000000000000
2010-01-01	2.5318800000000000
2011-01-01	2.1441300000000000
2012-01-01	1.7733800000000000
2013-01-01	1.6867700000000000
2014-01-01	2.0668200000000000
2015-01-01	2.4310400000000003
2016-01-01	2.8963500000000000