Question: when did belmopan became the capital of belize
[{'answer': '1970', 'provenance': [{'wikipedia_id': '56626', 'title': 'Belmopan', 'start_paragraph_id': 1, 'start_character': 278, 'end_paragraph_id': 1, 'end_character': 282, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56626', 'title': 'Belmopan', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 384, 'bleu_score': 0.790608893399195, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6081865111888241963}, 'section': 'Section::::Abstract.'}]}]