Question: when did slopestyle snowboarding start in the olympics
[{'answer': '2014', 'provenance': [{'wikipedia_id': '5882291', 'title': 'Slopestyle', 'start_paragraph_id': 4, 'start_character': 82, 'end_paragraph_id': 4, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '5882291', 'title': 'Slopestyle', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 392, 'bleu_score': 0.9002470831246561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3065961074349569851}, 'section': 'Section::::History.\n'}]}]