Year	Number
2004-01-01	397054
2005-01-01	551440
2006-01-01	848032
2007-01-01	1210114
2008-01-01	1377384
2009-01-01	1664867
2010-01-01	1793664
2011-01-01	1990360
2012-01-01	2051658
2013-01-01	3061209
2014-01-01	4349400
2015-01-01	6181433
2016-01-01	7813225