Question: who was the us president when nafta was developed
[{'answer': 'Bill Clinton', 'provenance': [{'wikipedia_id': '22050', 'title': 'North American Free Trade Agreement', 'start_paragraph_id': 8, 'start_character': 1118, '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': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1130, 'bleu_score': 0.5468238909905541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8764235218656537917}, 'section': 'Section::::Negotiation, ratification, and revision (1988–94).\n'}]}]