Year	Number
2007-01-01	1441535
2008-01-01	2733007
2009-01-01	3338457
2010-01-01	4617235
2011-01-01	5688703
2012-01-01	6524718
2013-01-01	6577062
2014-01-01	6710335
2015-01-01	8123501
2016-01-01	7308067