Year	Number
2007-01-01	0
2008-01-01	0
2009-01-01	100000
2010-01-01	200000
2011-01-01	800000
2012-01-01	3300000
2013-01-01	9000000
2014-01-01	15400000
2015-01-01	20100000
2016-01-01	25600