Year	Number
2004-01-01	844
2005-01-01	962
2006-01-01	815
2007-01-01	1017
2008-01-01	955
2009-01-01	960
2010-01-01	1299
2011-01-01	1804
2012-01-01	2668
2013-01-01	3502
2014-01-01	3960
2015-01-01	2422