Year	Number
2004-01-01	5611
2005-01-01	3377
2006-01-01	3488
2007-01-01	4730
2008-01-01	5577
2009-01-01	12634
2010-01-01	19976
2011-01-01	19868
2012-01-01	31525
2013-01-01	40672
2014-01-01	54611
2015-01-01	37323
2016-01-01	44917