Year	Number
2004-01-01	312
2005-01-01	580
2006-01-01	724
2007-01-01	861
2008-01-01	887
2009-01-01	503
2010-01-01	578
2011-01-01	875
2012-01-01	1352
2013-01-01	1606
2014-01-01	3511
2015-01-01	5326
2016-01-01	7058