Year	Number
2008-01-01	13190212
2009-01-01	14090394
2010-01-01	15687845
2011-01-01	17465226
2012-01-01	19400261
2013-01-01	20445536
2014-01-01	21489835
2015-01-01	20370952
2016-01-01	22432594