Year	Number
2007-01-01	231524
2008-01-01	282300
2009-01-01	317371
2010-01-01	358254
2011-01-01	398500
2012-01-01	448837
2013-01-01	487307
2014-01-01	530848
2015-01-01	586204
2016-01-01	683428