Year	Percent
1998-01-01	12.900000000000000
1999-01-01	12.500000000000000
2000-01-01	11.300000000000000
2001-01-01	8.300000000000000
2002-01-01	5.300000000000000
2003-01-01	2.400000000000000
2004-01-01	2.200000000000000
2005-01-01	0.600000000000000
2006-01-01	1.000000000000000
2007-01-01	1.000000000000000
2008-01-01	6.100000000000000
2009-01-01	24.000000000000000
2010-01-01	23.333800000000000
2011-01-01	18.843100000000000
2012-01-01	14.801700000000000
2013-01-01	11.585999999999999
2014-01-01	8.186050000000000
2015-01-01	5.796930000000001
2016-01-01	4.870580000000000