Question: what year did the ls engines come into production
[{'answer': 'January 1995', 'provenance': [{'wikipedia_id': '877441', 'title': 'LS based GM small-block engine', 'start_paragraph_id': 1, 'start_character': 131, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '877441', 'title': 'LS based GM small-block engine', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 456, 'bleu_score': 0.8803188893452111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5810590288397367386}, 'section': 'Section::::Abstract.'}]}]