Year	Number
2004-01-01	135
2005-01-01	170
2006-01-01	159
2007-01-01	152
2008-01-01	147
2009-01-01	194
2010-01-01	199
2011-01-01	212
2012-01-01	230
2013-01-01	280
2014-01-01	396
2015-01-01	467
2016-01-01	535