Year	Number
2004-01-01	578
2005-01-01	523
2006-01-01	634
2007-01-01	615
2008-01-01	573
2009-01-01	1098
2010-01-01	945
2011-01-01	1196
2012-01-01	4182
2013-01-01	4509
2014-01-01	5457
2015-01-01	5650
2016-01-01	5709