Year	Number
2004-01-01	35
2005-01-01	279
2006-01-01	1245
2007-01-01	3743
2008-01-01	9640
2009-01-01	23703
2010-01-01	33581
2011-01-01	35510
2012-01-01	43769
2013-01-01	51472
2014-01-01	61447
2015-01-01	64996
2016-01-01	72397