Year	Number
2004-01-01	12713
2005-01-01	14888
2006-01-01	19872
2007-01-01	19872
2008-01-01	19742
2009-01-01	13413
2010-01-01	12474
2011-01-01	403309
2012-01-01	435249
2013-01-01	477258
2014-01-01	512352
2015-01-01	1089003
2016-01-01	18760