Year	Number
2004-01-01	6558
2005-01-01	6739
2006-01-01	6631
2007-01-01	7284
2008-01-01	7535
2009-01-01	8038
2010-01-01	8270
2011-01-01	7562
2012-01-01	7198
2013-01-01	7193
2014-01-01	7109
2015-01-01	7125