Year	Number
2005-01-01	15862958
2006-01-01	19388892
2007-01-01	22721833
2008-01-01	22994564
2009-01-01	23615858
2010-01-01	23857850
2011-01-01	27831528
2012-01-01	31994782
2013-01-01	36205800
2014-01-01	37517526
2015-01-01	41472676