Year	Number
2004-01-01	1645
2005-01-01	1673
2006-01-01	5712
2007-01-01	6490
2008-01-01	7365
2009-01-01	6520
2010-01-01	2288
2011-01-01	2198
2012-01-01	2137
2013-01-01	2276
2014-01-01	2419
2015-01-01	2424
2016-01-01	2157