Year	Number
2004-01-01	3290
2005-01-01	4354
2006-01-01	6035
2007-01-01	7452
2008-01-01	9246
2009-01-01	9702
2010-01-01	10102
2011-01-01	11006
2012-01-01	10987
2013-01-01	10772
2014-01-01	10950
2015-01-01	11492
2016-01-01	11127
2017-01-01	11069