Year	Number
2004-01-01	0.0000
2005-01-01	0.0000
2006-01-01	0.4867
2007-01-01	1.0943
2008-01-01	1.5623
2009-01-01	2.0389
2010-01-01	3.4750
2011-01-01	3.7014
2012-01-01	4.1017
2013-01-01	4.2472
2014-01-01	4.4194
2015-01-01	4.7493