Question: who led the nfl in rushing yards last year
[{'answer': 'Ezekiel Elliott', 'provenance': [{'wikipedia_id': '32026271', 'title': 'List of National Football League rushing champions', 'start_paragraph_id': 3, 'start_character': 674, 'end_paragraph_id': 3, 'end_character': 689, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32026271', 'title': 'List of National Football League rushing champions', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 761, 'bleu_score': 0.823420498532855, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13052701107825800310}, 'section': 'Section::::Abstract.'}]}]