Year	Number
2004-01-01	594
2005-01-01	597
2006-01-01	557
2007-01-01	538
2008-01-01	564
2009-01-01	568
2010-01-01	550
2011-01-01	551
2012-01-01	554
2013-01-01	552
2014-01-01	619
2015-01-01	572
2016-01-01	588