Year	Number
2004-01-01	1298
2005-01-01	1396
2006-01-01	1508
2007-01-01	1540
2008-01-01	1626
2009-01-01	1718
2010-01-01	1852
2011-01-01	2098
2012-01-01	2378
2013-01-01	2715
2014-01-01	2845
2015-01-01	3419