Question: when did silver coins stop being made in uk
[{'answer': '1947', 'provenance': [{'wikipedia_id': '16522275', 'title': 'Shilling (British coin)', 'start_paragraph_id': 1, 'start_character': 530, 'end_paragraph_id': 1, 'end_character': 534, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16522275', 'title': 'Shilling (British coin)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 565, 'bleu_score': 0.9283692237337081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16828774665054864155}, 'section': 'Section::::Abstract.'}]}]