Question: when did they start calling new york the big apple
[{'answer': 'the 1920s', 'provenance': [{'wikipedia_id': '4691', 'title': 'Big Apple', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4691', 'title': 'Big Apple', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 0.959574895300321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17215666551569175835}, 'section': 'Section::::Abstract.'}]}]