Question: when did wisconsin change drinking age to 21
[{'answer': 'September 1 , 1986', 'provenance': [{'wikipedia_id': '25239131', 'title': 'Alcohol laws of Wisconsin', 'start_paragraph_id': 15, 'start_character': 308, 'end_paragraph_id': 15, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Drinking age.\n'}]}, {'provenance': [{'wikipedia_id': '25239131', 'title': 'Alcohol laws of Wisconsin', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 325, 'bleu_score': 0.9645876452711911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16457382852373264615}, 'section': 'Section::::Drinking age.\n'}]}]