Year	Number
2004-01-01	275
2005-01-01	275
2006-01-01	313
2007-01-01	323
2008-01-01	375
2009-01-01	386
2010-01-01	409
2011-01-01	452
2012-01-01	485
2013-01-01	513
2014-01-01	536
2015-01-01	532
2016-01-01	576
2017-01-01	617