Year	Percent
1999-01-01	0.06
2000-01-01	0.09
2001-01-01	0.13
2002-01-01	0.27
2003-01-01	0.47
2004-01-01	0.67
2005-01-01	0.88
2006-01-01	1.06
2007-01-01	1.37
2008-01-01	2.24
2009-01-01	4.28
2010-01-01	6.58
2011-01-01	6.16
2012-01-01	7.63
2013-01-01	8.43
2014-01-01	9.80
2015-01-01	11.02
2016-01-01	12.71