Year	Number
2004-01-01	13607
2005-01-01	23290
2006-01-01	46788
2007-01-01	92067
2008-01-01	158165
2009-01-01	400000
2010-01-01	417794
2011-01-01	573841
2012-01-01	986811
2013-01-01	1297162
2014-01-01	1762302