Year	Number
2004-01-01	475
2005-01-01	469
2006-01-01	460
2007-01-01	464
2008-01-01	454
2009-01-01	431
2010-01-01	438
2011-01-01	430
2012-01-01	419
2013-01-01	414
2014-01-01	405
2015-01-01	399
2016-01-01	395
2017-01-01	395