Year	Number
2004-01-01	5469
2005-01-01	6212
2006-01-01	6867
2007-01-01	7155
2008-01-01	7741
2009-01-01	8458
2010-01-01	9370
2011-01-01	10659
2012-01-01	12225
2013-01-01	14530
2014-01-01	15695
2015-01-01	17317
2016-01-01	19084