Question: in which year did the british shift india's capital from calcutta to delhi
[{'answer': '13 February 1931', 'provenance': [{'wikipedia_id': '51585', 'title': 'New Delhi', 'start_paragraph_id': 2, 'start_character': 210, 'end_paragraph_id': 2, 'end_character': 226, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51585', 'title': 'New Delhi', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 279, 'bleu_score': 0.852068716273483, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17903339605417820677}, 'section': 'Section::::Abstract.'}]}]