Year	Number
2004-01-01	3835
2005-01-01	1600
2006-01-01	3600
2007-01-01	7300
2008-01-01	8500
2009-01-01	9500
2010-01-01	11091
2011-01-01	11630
2012-01-01	15904
2013-01-01	20982
2014-01-01	18049
2015-01-01	26540
2016-01-01	26540