Question: when did lil durk sign to def jam
[{'answer': '2013', 'provenance': [{'wikipedia_id': '47456575', 'title': 'Lil Durk', 'start_paragraph_id': 3, 'start_character': 1126, 'end_paragraph_id': 3, 'end_character': 1130, 'bleu_score': 1.0, 'section': 'Section::::Early life.\n'}]}, {'provenance': [{'wikipedia_id': '47456575', 'title': 'Lil Durk', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 190, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1940467246528756213}, 'section': 'Section::::Career.:2013–2015: Signing to OTF and Def Jam Recordings and "Signed to the Streets".\n'}]}]