Year	Number
2006-01-01	18984872.0
2007-01-01	19617000.0
2008-01-01	20553088.0
2009-01-01	20465560.0
2010-01-01	20435595.0
2011-01-01	20583465.0
2012-01-01	21971822.0
2013-01-01	25501840.9
2014-01-01	26517403.0
2015-01-01	27613140.9