Question: when did the us put sanctions on iran
[{'answer': '1979', 'provenance': [{'wikipedia_id': '25699056', 'title': 'Sanctions against Iran', 'start_paragraph_id': 1, 'start_character': 85, 'end_paragraph_id': 1, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1987', 'provenance': [{'wikipedia_id': '25699056', 'title': 'Sanctions against Iran', 'start_paragraph_id': 2, 'start_character': 63, 'end_paragraph_id': 2, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1995', 'provenance': [{'wikipedia_id': '25699056', 'title': 'Sanctions against Iran', 'start_paragraph_id': 2, 'start_character': 222, 'end_paragraph_id': 2, 'end_character': 226, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '2006', 'provenance': [{'wikipedia_id': '25699056', 'title': 'Sanctions against Iran', 'start_paragraph_id': 3, 'start_character': 3, 'end_paragraph_id': 3, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]