Year	Number
2004-01-01	68
2005-01-01	185
2006-01-01	437
2007-01-01	837
2008-01-01	1333
2009-01-01	1365
2010-01-01	1500
2011-01-01	1568
2012-01-01	1933
2013-01-01	2065
2014-01-01	2148
2015-01-01	2117
2016-01-01	2240