Year	Number
2007-01-01	24319243
2008-01-01	26264783
2009-01-01	40140648
2010-01-01	41926817
2011-01-01	45904247
2012-01-01	60148949
2013-01-01	62346682
2014-01-01	64313104
2015-01-01	67547797