Question: when did they put gates on downing street
[{'answer': '1989', 'provenance': [{'wikipedia_id': '54862', 'title': 'Downing Street', 'start_paragraph_id': 31, 'start_character': 117, 'end_paragraph_id': 31, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Downing Street gates.\n'}]}, {'provenance': [{'wikipedia_id': '54862', 'title': 'Downing Street', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 343, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3584220594843030348}, 'section': 'Section::::Downing Street gates.\n'}]}]