Year	Number
2004-01-01	14147
2005-01-01	13821
2006-01-01	15041
2007-01-01	16324
2008-01-01	16766
2009-01-01	16700
2010-01-01	18094
2011-01-01	19817
2012-01-01	22851
2013-01-01	24179
2014-01-01	27544
2015-01-01	16242
2016-01-01	41139