Year	Number
2004-01-01	4213385
2005-01-01	5708146
2006-01-01	7766313
2007-01-01	9452552
2008-01-01	11566634
2009-01-01	13167826
2010-01-01	14854811
2011-01-01	17511174
2012-01-01	20393800
2013-01-01	24583662
2014-01-01	27949521
2015-01-01	31232823
2016-01-01	35412174