Year	Number
2004-01-01	5984384
2005-01-01	4268429
2006-01-01	4927398
2007-01-01	5747847
2008-01-01	6998816
2009-01-01	7135534
2010-01-01	8285687
2011-01-01	9473458
2012-01-01	10972864
2013-01-01	12729595
2014-01-01	14789704
2015-01-01	16420332
2016-01-01	18423943
2017-01-01	19515862