Question: when did the pound coin come into circulation
[{'answer': '21 April 1983', 'provenance': [{'wikipedia_id': '200442', 'title': 'One pound (British coin)', 'start_paragraph_id': 1, 'start_character': 345, 'end_paragraph_id': 1, 'end_character': 358, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '200442', 'title': 'One pound (British coin)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 759, 'bleu_score': 0.884512285468079, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9550621572055229334}, 'section': 'Section::::Abstract.'}]}]