Year	Number
2004-01-01	6408
2005-01-01	8405
2006-01-01	11464
2007-01-01	14209
2008-01-01	13751
2009-01-01	13325
2010-01-01	14862
2011-01-01	18328
2012-01-01	16879
2013-01-01	13597
2014-01-01	14405
2015-01-01	14148
2016-01-01	14148
2017-01-01	23151