Question: when did the first walmart open in california
[{'answer': 'By 1990', 'provenance': [{'wikipedia_id': '6119571', 'title': 'History of Walmart', 'start_paragraph_id': 14, 'start_character': 131, 'end_paragraph_id': 14, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::1980s and 1990s.\n'}]}, {'provenance': [{'wikipedia_id': '6119571', 'title': 'History of Walmart', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 395, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8906108528113867481}, 'section': 'Section::::1980s and 1990s.\n'}]}]