Year	Number
2004-01-01	3734522
2005-01-01	4661376
2006-01-01	4970944
2007-01-01	4939617
2008-01-01	5202013
2009-01-01	4236192
2010-01-01	3856218
2011-01-01	3464906
2012-01-01	3338748
2013-01-01	3273542
2014-01-01	3287244
2015-01-01	3216008
2016-01-01	3406233