Question: when did women's hockey became an olympic sport
[{'answer': '1998', 'provenance': [{'wikipedia_id': '1855215', 'title': 'Ice hockey at the Olympic Games', 'start_paragraph_id': 1, 'start_character': 270, 'end_paragraph_id': 1, 'end_character': 274, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1855215', 'title': 'Ice hockey at the Olympic Games', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 290, 'bleu_score': 0.959574895300321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4587413531079115047}, 'section': 'Section::::Abstract.'}]}]