date_collected  
2014-08-28      
2014-09-08      
2014-09-11      
2014-10-02      
2014-10-03      
2014-10-08      
2014-11-11      
2014-12-15      
2015-01-15      
2015-01-22      
2015-04-03      
2015-04-28      
2015-06-08      
2015-09-01