Year	Number
2004-01-01	0.1825
2005-01-01	0.2448
2006-01-01	0.2153
2007-01-01	0.2046
2008-01-01	0.2186
2009-01-01	0.2353
2010-01-01	0.2570
2011-01-01	0.2723
2012-01-01	0.3117
2013-01-01	0.6281
2014-01-01	1.1739
2015-01-01	2.6997
2016-01-01	3.4851