Year	Number
2008-01-01	6338
2009-01-01	6187
2010-01-01	6012
2011-01-01	5950
2012-01-01	5579
2013-01-01	5305
2014-01-01	5140
2015-01-01	4780
2016-01-01	4642
2017-01-01	4393