Question: when did johnny cash record i won back down
[{'answer': '2000', 'provenance': [{'wikipedia_id': '12935897', 'title': "I Won't Back Down", 'start_paragraph_id': 20, 'start_character': 70, 'end_paragraph_id': 20, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Use in political campaigns.\n'}]}]