Year	Number
2004-01-01	3329
2005-01-01	3886
2006-01-01	4299
2007-01-01	4844
2008-01-01	17852
2009-01-01	19995
2010-01-01	24937
2011-01-01	25297
2012-01-01	30776
2013-01-01	27119
2014-01-01	26065
2015-01-01	34766
2016-01-01	40166
2017-01-01	34855