Year	Number
2004-01-01	17485
2005-01-01	30937
2006-01-01	68603
2007-01-01	137874
2008-01-01	235046
2009-01-01	437587
2010-01-01	746167
2011-01-01	1325161
2012-01-01	1930412
2013-01-01	2978783
2014-01-01	3353290
2015-01-01	4154149
2016-01-01	5126797