Year	Number
2004-01-01	16197
2005-01-01	16027
2006-01-01	15046
2007-01-01	12121
2008-01-01	9789
2009-01-01	7646
2010-01-01	8353
2011-01-01	19524
2012-01-01	23561
2013-01-01	24655
2014-01-01	26315
2015-01-01	26872
2016-01-01	30404
2017-01-01	33608