Year	Number
2004-01-01	64
2005-01-01	154
2006-01-01	357
2007-01-01	664
2008-01-01	1003
2009-01-01	1046
2010-01-01	1107
2011-01-01	1142
2012-01-01	1325
2013-01-01	1409
2014-01-01	1500
2015-01-01	1487