Year	Number
2004-01-01	59438
2005-01-01	120440
2006-01-01	212116
2007-01-01	637947
2008-01-01	819048
2009-01-01	325367
2010-01-01	566658
2011-01-01	1287460
2012-01-01	2473413
2013-01-01	3481618
2014-01-01	1270405
2015-01-01	1495216
2016-01-01	1346668
2017-01-01	1424058