Question: when was the last time usa womens hockey won gold
[{'answer': '2018', 'provenance': [{'wikipedia_id': '1690430', 'title': "United States women's national ice hockey team", 'start_paragraph_id': 1, 'start_character': 307, 'end_paragraph_id': 1, 'end_character': 311, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]