Year	Number
2004-01-01	261
2005-01-01	250
2006-01-01	292
2007-01-01	315
2008-01-01	391
2009-01-01	410
2010-01-01	418
2011-01-01	396
2012-01-01	407
2013-01-01	410
2014-01-01	414
2015-01-01	412
2016-01-01	418