Year	Number
2006-01-01	648727
2007-01-01	755151
2008-01-01	950395
2009-01-01	1131847
2010-01-01	1293941
2011-01-01	1901070
2012-01-01	2052903
2013-01-01	2641487
2014-01-01	3045290
2015-01-01	4028874
2016-01-01	4634561