Year	Number
2004-01-01	138
2005-01-01	137
2006-01-01	143
2007-01-01	157
2008-01-01	216
2009-01-01	277
2010-01-01	343
2011-01-01	392
2012-01-01	422
2013-01-01	445
2014-01-01	399
2015-01-01	454
2016-01-01	462