Year	Number
2008-01-01	1771452
2009-01-01	2007529
2010-01-01	2721015
2011-01-01	2812526
2012-01-01	3699393
2013-01-01	4245243
2014-01-01	4212578
2015-01-01	4203172
2016-01-01	4964774
2017-01-01	5415642