Year	Number
2004-01-01	2863
2005-01-01	3487
2006-01-01	4215
2007-01-01	4191
2008-01-01	5227
2009-01-01	6271
2010-01-01	8187
2011-01-01	9074
2012-01-01	10020
2013-01-01	8660
2014-01-01	13356
2015-01-01	19708