Year	Number
2004-01-01	2
2005-01-01	2
2006-01-01	12
2007-01-01	40
2008-01-01	48
2009-01-01	55
2010-01-01	61
2011-01-01	78
2012-01-01	114
2013-01-01	126
2014-01-01	149
2015-01-01	176
2016-01-01	169