Year	Number
2004-01-01	844
2005-01-01	962
2006-01-01	1035
2007-01-01	1236
2008-01-01	1214
2009-01-01	1384
2010-01-01	1563
2011-01-01	1868
2012-01-01	3474
2013-01-01	3608
2014-01-01	4238
2015-01-01	2995