Question: when was the first land before time movie made
[{'answer': '1988', 'provenance': [{'wikipedia_id': '1239400', 'title': 'The Land Before Time', 'start_paragraph_id': 1, 'start_character': 26, 'end_paragraph_id': 1, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1239400', 'title': 'The Land Before Time', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 217, 'bleu_score': 0.8037909832515441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17716096081660998227}, 'section': 'Section::::Abstract.'}]}]