Year	Number
2004-01-01	5757956
2005-01-01	6143748
2006-01-01	6963083
2007-01-01	7468692
2008-01-01	7999888
2009-01-01	8321059
2010-01-01	9291912
2011-01-01	10301703
2012-01-01	10518930
2013-01-01	11974460
2014-01-01	15484903
2015-01-01	14422283
2016-01-01	14657396