Question: when did the roof gardens above kensington open to the public
[{'answer': '1980s'}, {'provenance': [{'wikipedia_id': '1054975', 'title': 'Kensington Roof Gardens', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 160, 'bleu_score': 0.5202672617921671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4697051913050513284}, 'section': 'Section::::History.\n'}]}]