Year	Number
2004-01-01	11140000
2005-01-01	13980000
2006-01-01	17180000
2007-01-01	16857189
2008-01-01	19153032
2009-01-01	19608571
2010-01-01	20724894
2011-01-01	20673607
2012-01-01	19312926
2013-01-01	19271479
2014-01-01	19421695
2015-01-01	21087864
2016-01-01	23593868