Year	Percent
1999-01-01	3.29571999999999980
2000-01-01	0.39808899999999997
2001-01-01	0.24804500000000000
2002-01-01	0.20547300000000000
2003-01-01	0.12113499999999999
2004-01-01	0.10540000000000000
2005-01-01	0.03624100000000000
2006-01-01	0.40549400000000000
2007-01-01	0.13024000000000002
2008-01-01	0.38375000000000000
2009-01-01	2.59193000000000000
2010-01-01	3.52975000000000000
2011-01-01	4.29226000000000000
2012-01-01	4.92770000000000000
2013-01-01	6.40069000000000000
2014-01-01	6.89673999999999900
2015-01-01	8.01362000000000000