Year	Number
2004-01-01	14889837
2005-01-01	18000737
2006-01-01	18803865
2007-01-01	19517789
2008-01-01	20470614
2009-01-01	21231338
2010-01-01	27106200
2011-01-01	31394944
2012-01-01	34001201
2013-01-01	46812404
2014-01-01	50820248
2015-01-01	55503981
2016-01-01	60827141