Question: when did the 24 valve cummins come out
[{'answer': '1998', 'provenance': [{'wikipedia_id': '1605981', 'title': 'Cummins B Series engine', 'start_paragraph_id': 5, 'start_character': 384, 'end_paragraph_id': 5, 'end_character': 388, 'bleu_score': 1.0, 'section': 'Section::::General engine features.\n'}]}, {'provenance': [{'wikipedia_id': '1605981', 'title': 'Cummins B Series engine', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 388, 'bleu_score': 0.92860998190983, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4253448828695687977}, 'section': 'Section::::General engine features.\n'}]}]