Year	Number
2004-01-01	260325
2005-01-01	476076
2006-01-01	567718
2007-01-01	605060
2008-01-01	652014
2009-01-01	959760
2010-01-01	2436083
2011-01-01	2512436
2012-01-01	2669490
2013-01-01	2745180
2014-01-01	3830306
2015-01-01	4071100