Question: when did rolls royce start making plane engines
[{'answer': '1914', 'provenance': [{'wikipedia_id': '5455080', 'title': 'Rolls-Royce Limited', 'start_paragraph_id': 19, 'start_character': 35, 'end_paragraph_id': 19, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Motor cars.:Rolls-Royce Eagle aero-engine.\n'}]}, {'provenance': [{'wikipedia_id': '5455080', 'title': 'Rolls-Royce Limited', 'start_paragraph_id': 19, 'start_character': 4, 'end_paragraph_id': 19, 'end_character': 336, 'bleu_score': 0.7979131881854951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8966516209583281386}, 'section': 'Section::::Motor cars.:Rolls-Royce Eagle aero-engine.\n'}]}]