Question: when did pepsi change from sugar to corn syrup
[{'answer': 'the 1980s', 'provenance': [{'wikipedia_id': '25688014', 'title': 'Pepsi-Cola Made with Real Sugar', 'start_paragraph_id': 1, 'start_character': 370, 'end_paragraph_id': 1, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25688014', 'title': 'Pepsi-Cola Made with Real Sugar', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 652, 'bleu_score': 0.579158749500234, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13947800754370291755}, 'section': 'Section::::Abstract.'}]}]