Year	Number
2004-01-01	1927
2005-01-01	2146
2006-01-01	6499
2007-01-01	7557
2008-01-01	8003
2009-01-01	7081
2010-01-01	2839
2011-01-01	2702
2012-01-01	2638
2013-01-01	2773
2014-01-01	3002
2015-01-01	2740
2016-01-01	2176