Year	Number
2004-01-01	31270540
2005-01-01	36158336
2006-01-01	38104180
2007-01-01	39182264
2008-01-01	41195553
2009-01-01	42010584
2010-01-01	44070143
2011-01-01	46332005
2012-01-01	49441220
2013-01-01	54219375
2014-01-01	55107016
2015-01-01	52541282
2016-01-01	52714063