Year	Number
2004-01-01	7710
2005-01-01	9196
2006-01-01	12877
2007-01-01	12445
2008-01-01	14296
2009-01-01	16801
2010-01-01	26936
2011-01-01	30525
2012-01-01	57102
2013-01-01	60230
2014-01-01	68634
2015-01-01	81490