Year	Number
2004-01-01	887
2005-01-01	1256
2006-01-01	1542
2007-01-01	2085
2008-01-01	2452
2009-01-01	2701
2010-01-01	3063
2011-01-01	3317
2012-01-01	3701
2013-01-01	4088
2014-01-01	4362
2015-01-01	4414
2016-01-01	4386