Year	Number
2006-01-01	234
2007-01-01	255
2008-01-01	266
2009-01-01	1611
2010-01-01	2932
2011-01-01	4624
2012-01-01	6450
2013-01-01	8227
2014-01-01	9200
2015-01-01	9359
2016-01-01	9148