Question: when was the social model of disability introduced
[{'answer': 'the 1980s', 'provenance': [{'wikipedia_id': '1117658', 'title': 'Social model of disability', 'start_paragraph_id': 1, 'start_character': 791, 'end_paragraph_id': 1, 'end_character': 800, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1117658', 'title': 'Social model of disability', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 800, 'bleu_score': 0.9839344367380701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 502537808273497065}, 'section': 'Section::::Abstract.'}]}]