Question: when did belfast become the capital of northern ireland
[{'answer': '1922', 'provenance': [{'wikipedia_id': '5046', 'title': 'Belfast', 'start_paragraph_id': 2, 'start_character': 678, 'end_paragraph_id': 2, 'end_character': 682, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5046', 'title': 'Belfast', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 772, 'bleu_score': 0.659807241036482, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13829544496778923164}, 'section': 'Section::::Abstract.'}]}]