Year	Number
2004-01-01	9073332
2005-01-01	10229750
2006-01-01	11804642
2007-01-01	13217022
2008-01-01	13812556
2009-01-01	14269656
2010-01-01	15261757
2011-01-01	17059402
2012-01-01	19489987
2013-01-01	21380647
2014-01-01	23137574
2015-01-01	24004028
2016-01-01	24337801