Year	Number
2007-01-01	331950
2008-01-01	344633
2009-01-01	346283
2010-01-01	351839
2011-01-01	357979
2012-01-01	667793
2013-01-01	648575
2014-01-01	631766
2015-01-01	641124
2016-01-01	621592
2017-01-01	643439