Question: the types of asbestos known as 'blue' and 'brown' asbestos were banned in the uk in what year
[{'answer': 'mid-1980s', 'provenance': [{'wikipedia_id': '21492663', 'title': 'Asbestos', 'start_paragraph_id': 56, 'start_character': 345, 'end_paragraph_id': 56, 'end_character': 354, 'bleu_score': 1.0, 'section': 'Section::::History.:Usage by industry and product type.:Amphibole group.\n'}]}, {'provenance': [{'wikipedia_id': '21492663', 'title': 'Asbestos', 'start_paragraph_id': 56, 'start_character': 0, 'end_paragraph_id': 56, 'end_character': 456, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6890933986358964255}, 'section': 'Section::::History.:Usage by industry and product type.:Amphibole group.\n'}]}]