Year	Number
2008-01-01	2671
2009-01-01	3104
2010-01-01	3340
2011-01-01	3551
2012-01-01	3907
2013-01-01	4246
2014-01-01	4375
2015-01-01	4571
2016-01-01	4816
2017-01-01	4912