Year	Number
2004-01-01	13435694
2005-01-01	8026804
2006-01-01	9315768
2007-01-01	11037280
2008-01-01	13429562
2009-01-01	14114240
2010-01-01	16650757
2011-01-01	19350818
2012-01-01	19839363
2013-01-01	22144265
2014-01-01	25529715
2015-01-01	28456680
2016-01-01	31891359
2017-01-01	33621347