Year	Number
2004-01-01	18
2005-01-01	19
2006-01-01	29
2007-01-01	34
2008-01-01	39
2009-01-01	45
2010-01-01	38
2011-01-01	37
2012-01-01	38
2013-01-01	38
2014-01-01	39
2015-01-01	31
2016-01-01	42