Year	Number
2004-01-01	397
2005-01-01	405
2006-01-01	407
2007-01-01	416
2008-01-01	430
2009-01-01	438
2010-01-01	441
2011-01-01	454
2012-01-01	443
2013-01-01	442
2014-01-01	488
2015-01-01	516
2016-01-01	539
2017-01-01	578