Question: who was the president when nafta was passed
[{'answer': 'Clinton', 'provenance': [{'wikipedia_id': '22050', 'title': 'North American Free Trade Agreement', 'start_paragraph_id': 8, 'start_character': 1123, 'end_paragraph_id': 8, 'end_character': 1130, 'bleu_score': 1.0, 'section': 'Section::::Negotiation, ratification, and revision (1988–94).\n'}]}, {'provenance': [{'wikipedia_id': '22050', 'title': 'North American Free Trade Agreement', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1096, 'bleu_score': 0.9094379505704621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2196163590329820208}, 'section': 'Section::::Negotiation, ratification, and revision (1988–94).\n'}]}]