Year	Number
2004-01-01	2469554
2005-01-01	2782401
2006-01-01	2913537
2007-01-01	4180888
2008-01-01	4070825
2009-01-01	3912863
2010-01-01	4086814
2011-01-01	4229125
2012-01-01	4320935
2013-01-01	4447183
2014-01-01	4688409
2015-01-01	5016046
2016-01-01	5466352
2017-01-01	5840978