Question: when was the last refinery built in the united states
[{'answer': '1976', 'provenance': [{'wikipedia_id': '195137', 'title': 'Oil refinery', 'start_paragraph_id': 22, 'start_character': 316, 'end_paragraph_id': 22, 'end_character': 320, 'bleu_score': 1.0, 'section': 'Section::::History.:Oil refining in the United States.\n'}]}, {'provenance': [{'wikipedia_id': '195137', 'title': 'Oil refinery', 'start_paragraph_id': 95, 'start_character': 0, 'end_paragraph_id': 95, 'end_character': 813, 'bleu_score': 0.953442195146827, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2288403887902907104}, 'section': 'Section::::Safety and environment.\n'}]}]