Question: when was the new £1 coin introduced
[{'answer': '2016', 'provenance': [{'wikipedia_id': '200442', 'title': 'One pound (British coin)', 'start_paragraph_id': 18, 'start_character': 33, 'end_paragraph_id': 18, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Mintage figures.:Round coin.\n'}]}]