Year	Number
2004-01-01	346
2005-01-01	335
2006-01-01	335
2007-01-01	335
2008-01-01	338
2009-01-01	336
2010-01-01	332
2011-01-01	327
2012-01-01	311
2013-01-01	311
2014-01-01	317
2015-01-01	311
2016-01-01	312