Question: when did the usa last qualify for world cup
[{'answer': '2014', 'provenance': [{'wikipedia_id': '40877989', 'title': 'United States at the FIFA World Cup', 'start_paragraph_id': 1, 'start_character': 424, 'end_paragraph_id': 1, 'end_character': 428, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]