Question: when did the song why by nf come out
[{'answer': '2018', 'provenance': [{'wikipedia_id': '45521772', 'title': 'NF (rapper)', 'start_paragraph_id': 10, 'start_character': 494, 'end_paragraph_id': 10, 'end_character': 498, 'bleu_score': 1.0, 'section': 'Section::::Career.\n'}]}]