Question: when did dirty jobs go off the air
[{'answer': 'September 12 , 2012', 'provenance': [{'wikipedia_id': '2525506', 'title': 'Dirty Jobs', 'start_paragraph_id': 1, 'start_character': 369, 'end_paragraph_id': 1, 'end_character': 388, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2525506', 'title': 'Dirty Jobs', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 494, 'bleu_score': 0.9143938493547231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3201348481491587597}, 'section': 'Section::::Abstract.'}]}]