Question: when did star trek go off the air
[{'answer': 'June 3 , 1969', 'provenance': [{'wikipedia_id': '17157886', 'title': 'Star Trek', 'start_paragraph_id': 40, 'start_character': 78, 'end_paragraph_id': 40, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Television.:"The Original Series" (1966–1969).\n'}]}, {'provenance': [{'wikipedia_id': '17157886', 'title': 'Star Trek', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 421, 'bleu_score': 0.9357502588195491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16840054359017502289}, 'section': 'Section::::Television.:"The Original Series" (1966–1969).\n'}]}]