Year	Number
2007-01-01	10224
2008-01-01	15526
2009-01-01	21302
2010-01-01	24542
2011-01-01	25751
2012-01-01	26187
2013-01-01	27633
2014-01-01	37855
2015-01-01	20540
2016-01-01	21964