Question: when did the first walmart open in illinois
[{'answer': '1977', 'provenance': [{'wikipedia_id': '6119571', 'title': 'History of Walmart', 'start_paragraph_id': 5, 'start_character': 3, 'end_paragraph_id': 5, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::1960s and 1970s.\n'}]}, {'provenance': [{'wikipedia_id': '6119571', 'title': 'History of Walmart', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 394, 'bleu_score': 0.9679895851501501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7419991403105761044}, 'section': 'Section::::1960s and 1970s.\n'}]}]