Year	Number
2004-01-01	318
2005-01-01	323
2006-01-01	327
2007-01-01	326
2008-01-01	331
2009-01-01	337
2010-01-01	345
2011-01-01	344
2012-01-01	346
2013-01-01	339
2014-01-01	340
2015-01-01	346
2016-01-01	337