Question: in which year 6 major commercial banks were nationalised in india
[{'answer': '1980', 'provenance': [{'wikipedia_id': '1630037', 'title': 'Banking in India', 'start_paragraph_id': 3, 'start_character': 296, 'end_paragraph_id': 3, 'end_character': 300, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1630037', 'title': 'Banking in India', 'start_paragraph_id': 55, 'start_character': 0, 'end_paragraph_id': 55, 'end_character': 350, 'bleu_score': 0.55150607230683, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1114102303985820280}, 'section': 'Section::::History.:Nationalisation in 1969 and 1980.\n'}]}]