Year	Number
2004-01-01	1685
2005-01-01	2790
2006-01-01	4447
2007-01-01	5730
2008-01-01	6720
2009-01-01	6742
2010-01-01	5851
2011-01-01	5798
2012-01-01	5824
2013-01-01	5790
2014-01-01	5441
2015-01-01	5609
2016-01-01	6574
2017-01-01	7012