Question: when did nhl players start playing in olympics
[{'answer': '1998', 'provenance': [{'wikipedia_id': '5856737', 'title': 'List of Olympic medalists in ice hockey', 'start_paragraph_id': 1, 'start_character': 980, 'end_paragraph_id': 1, 'end_character': 984, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5856737', 'title': 'List of Olympic medalists in ice hockey', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1185, 'bleu_score': 0.989924111967827, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17923955639208791650}, 'section': 'Section::::Abstract.'}]}]