Year	Number
2004-01-01	13223365
2005-01-01	14449100
2006-01-01	15824585
2007-01-01	17794229
2008-01-01	18429300
2009-01-01	20423963
2010-01-01	21212320
2011-01-01	22256696
2012-01-01	25050389
2013-01-01	27116116
2014-01-01	28959425
2015-01-01	30786339
2016-01-01	32294152
2017-01-01	32294152