Year	Number
2004-01-01	156
2005-01-01	209
2006-01-01	265
2007-01-01	353
2008-01-01	436
2009-01-01	412
2010-01-01	392
2011-01-01	433
2012-01-01	521
2013-01-01	555
2014-01-01	560
2015-01-01	550