Year	Number
2004-01-01	19827686
2005-01-01	22686801
2006-01-01	23771995
2007-01-01	25944341
2008-01-01	26796394
2009-01-01	31857364
2010-01-01	30697975
2011-01-01	32494371
2012-01-01	33885739
2013-01-01	35227054
2014-01-01	60164785