Year	Number
2004-01-01	7102490
2005-01-01	7873147
2006-01-01	8961030
2007-01-01	9917315
2008-01-01	11031929
2009-01-01	12353105
2010-01-01	13628554
2011-01-01	15096025
2012-01-01	16259811
2013-01-01	17082673
2014-01-01	18080469
2015-01-01	19118250
2016-01-01	20044782