Year	Number
2007-01-01	19309
2008-01-01	23993
2009-01-01	22969
2010-01-01	21283
2011-01-01	20458
2012-01-01	20141
2013-01-01	18181
2014-01-01	17548
2015-01-01	15830
2016-01-01	13936
2017-01-01	8972