Question: when did rawalpindi became the temporary capital of pakistan
[{'answer': '1958'}, {'provenance': [{'wikipedia_id': '15016776', 'title': 'List of capitals in Pakistan', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 587, 'bleu_score': 0.836328765940605, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13907257403684119855}, 'section': 'Section::::National capital.\n'}]}]