Year	Number
2006-01-01	516
2007-01-01	555
2008-01-01	543
2009-01-01	583
2010-01-01	400
2011-01-01	331
2012-01-01	374
2013-01-01	374
2014-01-01	472
2015-01-01	568
2016-01-01	569