Question: when did trinidad and tobago become an independent nation
[{'answer': '1962', 'provenance': [{'wikipedia_id': '3565457', 'title': 'Trinidad and Tobago', 'start_paragraph_id': 2, 'start_character': 567, 'end_paragraph_id': 2, 'end_character': 571, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3565457', 'title': 'Trinidad and Tobago', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 601, 'bleu_score': 0.660847437612026, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11157176177825527597}, 'section': 'Section::::Abstract.'}]}]