Year	Number
2004-01-01	140
2005-01-01	153
2006-01-01	160
2007-01-01	194
2008-01-01	301
2009-01-01	364
2010-01-01	394
2011-01-01	396
2012-01-01	466
2013-01-01	520
2014-01-01	558
2015-01-01	578
2016-01-01	573