Year	Number
2004-01-01	1288
2005-01-01	1670
2006-01-01	2271
2007-01-01	2841
2008-01-01	3465
2009-01-01	4203
2010-01-01	4821
2011-01-01	5258
2012-01-01	5999
2013-01-01	6488
2014-01-01	7290
2015-01-01	8431