Question: what percentage of north korea's foreign trade is with china
[{'answer': '90 %', 'provenance': [{'wikipedia_id': '21260', 'title': 'Economy of North Korea', 'start_paragraph_id': 180, 'start_character': 655, 'end_paragraph_id': 180, 'end_character': 661, 'bleu_score': 1.0, 'section': 'Section::::External trade.\n'}]}, {'provenance': [{'wikipedia_id': '21260', 'title': 'Economy of North Korea', 'start_paragraph_id': 180, 'start_character': 0, 'end_paragraph_id': 180, 'end_character': 666, 'bleu_score': 0.9400346272745641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7051030291676775652}, 'section': 'Section::::External trade.\n'}]}]