Year	Number
2007-01-01	7868410
2008-01-01	8273287
2009-01-01	8527268
2010-01-01	8630876
2011-01-01	11710678
2012-01-01	12163540
2013-01-01	12182160
2014-01-01	12023452
2015-01-01	11949377
2016-01-01	12052702
2017-01-01	12013363