Question: when did jeep start making 4 door wranglers
[{'answer': 'The 2007 model year', 'provenance': [{'wikipedia_id': '895086', 'title': 'Jeep Wrangler', 'start_paragraph_id': 20, 'start_character': 55, 'end_paragraph_id': 20, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::JK (2006–2018).\n'}]}]