Year	Number
2004-01-01	1486
2005-01-01	2282
2006-01-01	2400
2007-01-01	1982
2008-01-01	2641
2009-01-01	3180
2010-01-01	3486
2011-01-01	3717
2012-01-01	3662
2013-01-01	3785
2014-01-01	4140
2015-01-01	4049
2016-01-01	3998