Question: when was the last lethal weapon movie made
[{'answer': '1998', 'provenance': [{'wikipedia_id': '24274594', 'title': 'Lethal Weapon (franchise)', 'start_paragraph_id': 1, 'start_character': 277, 'end_paragraph_id': 1, 'end_character': 281, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24274594', 'title': 'Lethal Weapon (franchise)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 533, 'bleu_score': 0.7405015188923121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14206535502835081230}, 'section': 'Section::::Abstract.'}]}]