Year	Number
2004-01-01	23712
2005-01-01	18009
2006-01-01	14240
2007-01-01	11836
2008-01-01	9119
2009-01-01	6180
2010-01-01	4059
2011-01-01	2591
2012-01-01	2352
2013-01-01	2219
2014-01-01	2115
2015-01-01	2013
2016-01-01	1928
2017-01-01	1867