Year	Number
2004-01-01	3067505
2005-01-01	4137821
2006-01-01	2740728
2007-01-01	2998131
2008-01-01	3359958
2009-01-01	3331823
2010-01-01	3634340
2011-01-01	4240215
2012-01-01	4407434