Year	Number
2004-01-01	13556
2005-01-01	14836
2006-01-01	16513
2007-01-01	18795
2008-01-01	21953
2009-01-01	23952
2010-01-01	27604
2011-01-01	31662
2012-01-01	34709
2013-01-01	40112
2014-01-01	43668
2015-01-01	46220
2016-01-01	46373
2017-01-01	47338