Year	Number
2007-01-01	1582
2008-01-01	6104
2009-01-01	23012
2010-01-01	39449
2011-01-01	50471
2012-01-01	76912
2013-01-01	113130
2014-01-01	123703
2015-01-01	143946
2016-01-01	165908