Year	Number
2004-01-01	6
2005-01-01	50
2006-01-01	55
2007-01-01	77
2008-01-01	82
2009-01-01	109
2010-01-01	121
2011-01-01	168
2012-01-01	199
2013-01-01	233
2014-01-01	284
2015-01-01	340
2016-01-01	466
2017-01-01	608