Year	Number
2004-01-01	2395565
2005-01-01	3015861
2006-01-01	3349765
2007-01-01	4215718
2008-01-01	4893643
2009-01-01	5459995
2010-01-01	6279031
2011-01-01	16043811
2012-01-01	15841717
2013-01-01	15819467
2014-01-01	15978483
2015-01-01	14832093
2016-01-01	14771750