Year	Number
2004-01-01	4669697
2005-01-01	5382939
2006-01-01	6400493
2007-01-01	7441164
2008-01-01	8407430
2009-01-01	8837249
2010-01-01	9193419
2011-01-01	9986480
2012-01-01	10792553
2013-01-01	10816189
2014-01-01	11334403
2015-01-01	12274794
2016-01-01	12920373
2017-01-01	13082207