Year	Number
2004-01-01	546
2005-01-01	474
2006-01-01	456
2007-01-01	619
2008-01-01	780
2009-01-01	761
2010-01-01	963
2011-01-01	1086
2012-01-01	1460
2013-01-01	4061
2014-01-01	2151
2015-01-01	3207
2016-01-01	3820