Year	Number
2007-01-01	1972048
2008-01-01	2299994
2009-01-01	2648092
2010-01-01	3108885
2011-01-01	3158524
2012-01-01	8026908
2013-01-01	9349746
2014-01-01	10346106
2015-01-01	11911565
2016-01-01	13643650
2017-01-01	15120654