Year	Number
2004-01-01	308
2005-01-01	388
2006-01-01	552
2007-01-01	535
2008-01-01	632
2009-01-01	597
2010-01-01	1122
2011-01-01	1315
2012-01-01	657
2013-01-01	1012
2014-01-01	1120
2015-01-01	1404
2016-01-01	1750