Question: when did a sixpence go out of circulation
[{'answer': '1980', 'provenance': [{'wikipedia_id': '2979509', 'title': 'Sixpence (British coin)', 'start_paragraph_id': 1, 'start_character': 206, 'end_paragraph_id': 1, 'end_character': 210, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2979509', 'title': 'Sixpence (British coin)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 372, 'bleu_score': 0.8747423163500201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6726135873201240142}, 'section': 'Section::::Abstract.'}]}]