Year	Number
2004-01-01	1269
2005-01-01	1944
2006-01-01	2458
2007-01-01	5302
2008-01-01	5437
2009-01-01	6766
2010-01-01	10521
2011-01-01	20402
2012-01-01	24234
2013-01-01	26202
2014-01-01	23813