Year	Number
2004-01-01	5377
2005-01-01	5869
2006-01-01	6483
2007-01-01	6587
2008-01-01	8190
2009-01-01	9188
2010-01-01	9646
2011-01-01	9095
2012-01-01	13776
2013-01-01	10510
2014-01-01	13473
2015-01-01	15516