Year	Number
2007-01-01	31542
2008-01-01	77565
2009-01-01	103883
2010-01-01	141265
2011-01-01	228746
2012-01-01	327741
2013-01-01	285015
2014-01-01	418968
2015-01-01	497551
2016-01-01	988475