Year	Number
2004-01-01	1866
2008-01-01	4338
2010-01-01	13408
2011-01-01	17626
2012-01-01	20375
2013-01-01	68710
2014-01-01	62283
2015-01-01	74608
2016-01-01	76991
2017-01-01	80896