Year	Number
2004-01-01	29
2005-01-01	29
2006-01-01	34
2007-01-01	39
2008-01-01	52
2009-01-01	62
2010-01-01	70
2011-01-01	80
2012-01-01	92
2013-01-01	97
2014-01-01	139
2015-01-01	160
2016-01-01	172