Year	Number
2004-01-01	7444
2005-01-01	5106
2006-01-01	5052
2007-01-01	3350
2008-01-01	3774
2009-01-01	4010
2010-01-01	4138
2011-01-01	6320
2012-01-01	5649
2013-01-01	5700
2014-01-01	6124
2015-01-01	6232
2016-01-01	6089