Year	Number
2004-01-01	31
2005-01-01	59
2006-01-01	70
2007-01-01	93
2008-01-01	131
2009-01-01	171
2010-01-01	206
2011-01-01	276
2012-01-01	313
2013-01-01	394
2014-01-01	460