Year	Number
2004-01-01	249
2005-01-01	292
2006-01-01	310
2007-01-01	339
2008-01-01	387
2009-01-01	334
2010-01-01	405
2011-01-01	497
2012-01-01	410
2013-01-01	332
2014-01-01	310
2015-01-01	378
2016-01-01	420