Year	Number
2004-01-01	18264
2005-01-01	25171
2006-01-01	21338
2007-01-01	26601
2008-01-01	11268
2009-01-01	54118
2010-01-01	92466
2011-01-01	123902
2012-01-01	436111
2013-01-01	455240
2014-01-01	336694
2015-01-01	316725
2016-01-01	2071730