Year	Number
2008-01-01	18688
2009-01-01	33879
2010-01-01	85043
2011-01-01	257110
2012-01-01	446183
2013-01-01	539755
2014-01-01	549582
2015-01-01	601668
2016-01-01	694646
2017-01-01	735945