Question: what was the last year ford made the sport trac
[{'answer': '2010', 'provenance': [{'wikipedia_id': '1639529', 'title': 'Ford Explorer Sport Trac', 'start_paragraph_id': 1, 'start_character': 271, 'end_paragraph_id': 1, 'end_character': 275, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]