Year	Number
2004-01-01	4273440
2005-01-01	5009198
2006-01-01	5924406
2007-01-01	6973548
2008-01-01	7878596
2009-01-01	8377415
2010-01-01	8761269
2011-01-01	9529478
2012-01-01	10306990
2013-01-01	9298653
2014-01-01	9776319
2015-01-01	11425909
2016-01-01	12189195
2017-01-01	12336345