Year	Number
2004-01-01	9494
2005-01-01	10250
2006-01-01	10483
2007-01-01	9938
2008-01-01	8994
2009-01-01	8270
2010-01-01	8922
2011-01-01	9298
2012-01-01	9750
2013-01-01	10330
2014-01-01	22808
2015-01-01	25587
2016-01-01	30725
2017-01-01	35073