Year	Number
2004-01-01	1387
2005-01-01	2135
2006-01-01	2384
2007-01-01	8561
2008-01-01	9921
2009-01-01	11212
2010-01-01	11207
2011-01-01	11561
2012-01-01	13640
2013-01-01	14692
2014-01-01	14167
2015-01-01	14669
2016-01-01	15282