Year	Number
2004-01-01	9651741
2005-01-01	10506048
2006-01-01	12926553
2007-01-01	14695706
2008-01-01	15756435
2009-01-01	14963335
2010-01-01	15347082
2011-01-01	17223259
2012-01-01	19423446
2013-01-01	21415551
2014-01-01	23091337
2015-01-01	23856470
2016-01-01	43252054
2017-01-01	46440608