Question: when did the legal age to drink change from 18 to 21
[{'answer': '1984', 'provenance': [{'wikipedia_id': '19197423', 'title': 'U.S. history of alcohol minimum purchase age by state', 'start_paragraph_id': 4, 'start_character': 157, 'end_paragraph_id': 4, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19197423', 'title': 'U.S. history of alcohol minimum purchase age by state', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 803, 'bleu_score': 0.9829771687435411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15749134915695861899}, 'section': 'Section::::Additional notes.\n'}]}]