Year	Number
2004-01-01	160
2005-01-01	244
2006-01-01	307
2007-01-01	447
2008-01-01	538
2009-01-01	391
2010-01-01	388
2011-01-01	395
2012-01-01	386
2013-01-01	359
2014-01-01	418
2015-01-01	407
2016-01-01	308