Year	Number
2007-01-01	6742
2008-01-01	3970
2009-01-01	4123
2010-01-01	3027
2011-01-01	3570
2012-01-01	27221
2013-01-01	32629
2014-01-01	73779
2015-01-01	87500
2016-01-01	223879
2017-01-01	237438