Question: when did the olympics become every 2 years
[{'answer': '1986', 'provenance': [{'wikipedia_id': '34069', 'title': 'Winter Olympic Games', 'start_paragraph_id': 2, 'start_character': 549, 'end_paragraph_id': 2, 'end_character': 553, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34069', 'title': 'Winter Olympic Games', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 717, 'bleu_score': 0.779160497179734, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1676330156923766695}, 'section': 'Section::::Abstract.'}]}]