Question: when did the last episode of futurama air
[{'answer': 'September 4 , 2013', 'provenance': [{'wikipedia_id': '228211', 'title': 'Futurama', 'start_paragraph_id': 100, 'start_character': 238, 'end_paragraph_id': 100, 'end_character': 256, 'bleu_score': 1.0, 'section': 'Section::::Broadcast.\n'}]}]