Year	Number
2007-01-01	29944
2008-01-01	39249
2009-01-01	40017
2010-01-01	31878
2011-01-01	25267
2012-01-01	22551
2013-01-01	22644
2014-01-01	23003
2015-01-01	26611
2016-01-01	28702
2017-01-01	30714