Year	Number
2008-01-01	4419
2009-01-01	4487
2010-01-01	4518
2011-01-01	4921
2012-01-01	5102
2013-01-01	5398
2014-01-01	5486
2015-01-01	5784
2016-01-01	5812
2017-01-01	5722