Year	Number
2004-01-01	171
2005-01-01	262
2006-01-01	334
2007-01-01	313
2008-01-01	473
2009-01-01	507
2010-01-01	466
2011-01-01	427
2012-01-01	415
2013-01-01	378
2014-01-01	388
2015-01-01	362