Question: when did the london docklands go into decline
[{'answer': 'by the 1980s', 'provenance': [{'wikipedia_id': '8839', 'title': 'London Docklands', 'start_paragraph_id': 1, 'start_character': 355, 'end_paragraph_id': 1, 'end_character': 367, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8839', 'title': 'London Docklands', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 779, 'bleu_score': 0.8776912606711361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18261362640574930511}, 'section': 'Section::::Abstract.'}]}]