Year	Number
2004-01-01	4708
2005-01-01	4892
2006-01-01	5176
2007-01-01	7287
2008-01-01	8003
2009-01-01	10278
2010-01-01	10880
2011-01-01	11165
2012-01-01	11354
2013-01-01	11903
2014-01-01	11643
2015-01-01	11626
2016-01-01	11309