Year	Number
2004-01-01	320
2005-01-01	323
2006-01-01	617
2007-01-01	1012
2008-01-01	1325
2009-01-01	1655
2010-01-01	2091
2011-01-01	2205
2012-01-01	2381
2013-01-01	2487
2014-01-01	2613
2015-01-01	2718
2016-01-01	2656