Year	Number
2004-01-01	2581
2005-01-01	2734
2006-01-01	2840
2007-01-01	3000
2008-01-01	3133
2009-01-01	3171
2010-01-01	3277
2011-01-01	3156
2012-01-01	2869
2013-01-01	2974
2014-01-01	2973
2015-01-01	2433