Year	Number
2004-01-01	25
2005-01-01	36
2006-01-01	23
2007-01-01	32
2008-01-01	31
2009-01-01	13
2010-01-01	12
2011-01-01	12
2012-01-01	11
2013-01-01	10
2014-01-01	21
2015-01-01	78
2016-01-01	143
2017-01-01	155