Year	Number
2004-01-01	0.3087
2005-01-01	0.3443
2006-01-01	0.3622
2007-01-01	0.3779
2008-01-01	0.4021
2009-01-01	0.5092
2010-01-01	0.6938
2011-01-01	1.2505
2012-01-01	2.8643
2013-01-01	1.2745
2014-01-01	1.5141
2015-01-01	1.8939
2016-01-01	4.9812