Question: when did smokey the bear start saying wildfires
[{'answer': 'April 2001', 'provenance': [{'wikipedia_id': '329797', 'title': 'Smokey Bear', 'start_paragraph_id': 2, 'start_character': 270, 'end_paragraph_id': 2, 'end_character': 280, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]