Question: when was the first constitution of pakistan passed
[{'answer': '1973', 'provenance': [{'wikipedia_id': '304824', 'title': 'Constitution of Pakistan', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '304824', 'title': 'Constitution of Pakistan', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 328, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8138464994622491576}, 'section': 'Section::::Origins and historical background.\n'}]}]