Question: when did the silver sixpence go out of circulation
[{'answer': '30 June 1980', 'provenance': [{'wikipedia_id': '2979509', 'title': 'Sixpence (British coin)', 'start_paragraph_id': 8, 'start_character': 575, 'end_paragraph_id': 8, 'end_character': 587, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2979509', 'title': 'Sixpence (British coin)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 587, 'bleu_score': 0.9559054761834711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13685052487277464207}, 'section': 'Section::::History.\n'}]}]