Year	Number
2004-01-01	601808
2005-01-01	1038367
2006-01-01	1286664
2007-01-01	1422911
2008-01-01	1583071
2009-01-01	1732865
2010-01-01	1961904
2011-01-01	2242073
2012-01-01	2956064
2013-01-01	2962578
2014-01-01	3466916
2015-01-01	3626003
2016-01-01	4076114