Question: when was the £20 note last changed
[{'answer': '2007', 'provenance': [{'wikipedia_id': '50353954', 'title': 'Bank of England £20 note', 'start_paragraph_id': 1, 'start_character': 188, 'end_paragraph_id': 1, 'end_character': 192, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50353954', 'title': 'Bank of England £20 note', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 976, 'bleu_score': 0.9445915737825161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11826484598209473648}, 'section': 'Section::::History.\n'}]}]