Year	Number
2008-01-01	2468363
2009-01-01	2659191
2010-01-01	2884318
2011-01-01	3295215
2012-01-01	4025678
2013-01-01	4015596
2014-01-01	4927008
2015-01-01	5001495
2016-01-01	5630050