Question: when did ghana begin the exportation of cocoa
[{'answer': '1891', 'provenance': [{'wikipedia_id': '13456417', 'title': 'Tetteh Quarshie', 'start_paragraph_id': 7, 'start_character': 495, 'end_paragraph_id': 7, 'end_character': 499, 'bleu_score': 1.0, 'section': 'Section::::Biography.\n'}]}, {'provenance': [{'wikipedia_id': '13456417', 'title': 'Tetteh Quarshie', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 878, 'bleu_score': 0.9867102250666441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16530044201747876374}, 'section': 'Section::::Biography.\n'}]}]