Year	Number
2004-01-01	1881
2005-01-01	1650
2006-01-01	2642
2007-01-01	3066
2008-01-01	1477
2009-01-01	556
2010-01-01	1587
2011-01-01	1866
2012-01-01	1564
2013-01-01	1856
2014-01-01	1742
2015-01-01	1267
2016-01-01	1224