Year	Number
2004-01-01	18176
2005-01-01	32003
2006-01-01	68816
2007-01-01	142087
2008-01-01	231556
2009-01-01	434821
2010-01-01	699044
2011-01-01	1326674
2012-01-01	1910135
2013-01-01	2843452
2014-01-01	3248606
2015-01-01	3965057
2016-01-01	4984662