Year	Number
2004-01-01	2326
2005-01-01	2637
2006-01-01	2880
2007-01-01	3247
2008-01-01	3628
2009-01-01	3934
2010-01-01	4770
2011-01-01	5218
2012-01-01	5574
2013-01-01	4712
2014-01-01	5395
2015-01-01	5605
2016-01-01	5998