Year	Number
2004-01-01	17726
2005-01-01	17310
2006-01-01	16151
2007-01-01	16014
2008-01-01	15910
2009-01-01	15771
2010-01-01	15277
2011-01-01	15012
2012-01-01	14851
2013-01-01	14471
2014-01-01	14040
2015-01-01	13481
2016-01-01	12411
2017-01-01	11626