Year	Number
2004-01-01	508
2005-01-01	587
2006-01-01	526
2007-01-01	756
2008-01-01	878
2009-01-01	1191
2010-01-01	2090
2011-01-01	27782
2012-01-01	29946
2013-01-01	4762
2014-01-01	6624
2015-01-01	7450
2016-01-01	6752
2017-01-01	7549