Year	Number
2004-01-01	8104
2005-01-01	11325
2006-01-01	14718
2007-01-01	20931
2008-01-01	27965
2009-01-01	28938
2010-01-01	30163
2011-01-01	32997
2012-01-01	36152
2013-01-01	40350
2014-01-01	36596
2015-01-01	33334
2016-01-01	33783
2017-01-01	37003