Question: when did north korea start competing in the winter olympics
[{'answer': '1964', 'provenance': [{'wikipedia_id': '14709530', 'title': 'North Korea at the Olympics', 'start_paragraph_id': 1, 'start_character': 117, 'end_paragraph_id': 1, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14709530', 'title': 'North Korea at the Olympics', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 443, 'bleu_score': 0.9731482306711111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13467388209676400772}, 'section': 'Section::::History.\n'}]}]