Year	Number
2004-01-01	5807
2005-01-01	6312
2006-01-01	6092
2007-01-01	5536
2008-01-01	4953
2009-01-01	4590
2010-01-01	5245
2011-01-01	5447
2012-01-01	5379
2013-01-01	5297
2014-01-01	14416
2015-01-01	15803
2016-01-01	19386
2017-01-01	22756