Year	Number
2007-01-01	7840
2008-01-01	8614
2009-01-01	9252
2010-01-01	11496
2011-01-01	10889
2012-01-01	12281
2013-01-01	13679
2014-01-01	14424
2015-01-01	14817
2016-01-01	15227
2017-01-01	15709