Year	Number
2007-01-01	30046
2008-01-01	39425
2009-01-01	40142
2010-01-01	31980
2011-01-01	25387
2012-01-01	22658
2013-01-01	22771
2014-01-01	23040
2015-01-01	26696
2016-01-01	28845
2017-01-01	30903