Question: when did the us ratify the kyoto protocol
[{'answer': 'has not ratified the Protocol', 'provenance': [{'wikipedia_id': '16775', 'title': 'Kyoto Protocol', 'start_paragraph_id': 129, 'start_character': 46, 'end_paragraph_id': 129, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Ratification process.:Non-ratification by the US.\n'}]}, {'provenance': [{'wikipedia_id': '16775', 'title': 'Kyoto Protocol', 'start_paragraph_id': 129, 'start_character': 0, 'end_paragraph_id': 129, 'end_character': 378, 'bleu_score': 0.9192507668025021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9319111459771016965}, 'section': 'Section::::Ratification process.:Non-ratification by the US.\n'}]}]