Question: when did they change the coca cola recipe
[{'answer': 'April 23 , 1985', 'provenance': [{'wikipedia_id': '355129', 'title': 'New Coke', 'start_paragraph_id': 15, 'start_character': 27, 'end_paragraph_id': 15, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Launch.\n'}]}, {'provenance': [{'wikipedia_id': '355129', 'title': 'New Coke', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 433, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6663764350411266065}, 'section': 'Section::::Launch.\n'}]}]