Year	Number
2008-01-01	4437767
2009-01-01	4765341
2010-01-01	6332863
2011-01-01	11514589
2012-01-01	5892674
2013-01-01	7272040
2014-01-01	8523040
2015-01-01	8895180
2016-01-01	7406185