Year	Number
2004-01-01	8620785
2005-01-01	9714032
2006-01-01	11254609
2007-01-01	12602598
2008-01-01	13265072
2009-01-01	13688876
2010-01-01	14594248
2011-01-01	16319599
2012-01-01	18649543
2013-01-01	20474162
2014-01-01	22149080
2015-01-01	22953342
2016-01-01	23190653