Year	Number
2004-01-01	5817
2005-01-01	5988
2006-01-01	6229
2007-01-01	5420
2008-01-01	5671
2009-01-01	5829
2010-01-01	5858
2011-01-01	5692
2012-01-01	5426
2013-01-01	5133
2014-01-01	4703
2015-01-01	3102
2016-01-01	2580
2017-01-01	2637