Question: when did scotland last win calcutta cup at murrayfield
[{'answer': '2018', 'provenance': [{'wikipedia_id': '481076', 'title': 'Calcutta Cup', 'start_paragraph_id': 1, 'start_character': 431, 'end_paragraph_id': 1, 'end_character': 435, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]