Year	Number
2004-01-01	22795768
2005-01-01	23934903
2006-01-01	24858359
2007-01-01	25787022
2008-01-01	26807288
2009-01-01	27491834
2010-01-01	33540746
2011-01-01	48869068
2012-01-01	57179153
2013-01-01	56077107
2014-01-01	58055942
2015-01-01	63778628
2016-01-01	69016727