Year	Number
2006-01-01	19737
2007-01-01	8786
2008-01-01	5536
2009-01-01	3747
2010-01-01	3615
2011-01-01	3634
2012-01-01	3568
2013-01-01	3764
2014-01-01	3895
2015-01-01	4038
2016-01-01	4161