Year	Number
2008-01-01	21494659
2009-01-01	21991770
2010-01-01	23366054
2011-01-01	27619611
2012-01-01	28190904
2013-01-01	28712215
2014-01-01	30611517
2015-01-01	32634681
2016-01-01	34246947