Year	Number
2004-01-01	3472
2005-01-01	3110
2006-01-01	3173
2007-01-01	3435
2008-01-01	3569
2009-01-01	3867
2010-01-01	4196
2011-01-01	4536
2012-01-01	4826
2013-01-01	5080
2014-01-01	5334
2015-01-01	6428
2016-01-01	6528