Question: when was snowboarding half pipe added to the olympics
[{'answer': '1998 Winter Olympics', 'provenance': [{'wikipedia_id': '4060201', 'title': 'Snowboarding at the Winter Olympics', 'start_paragraph_id': 1, 'start_character': 82, 'end_paragraph_id': 1, 'end_character': 102, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4060201', 'title': 'Snowboarding at the Winter Olympics', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1596, 'bleu_score': 0.983337793658805, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8072033324748204981}, 'section': 'Section::::Abstract.'}]}]