Question: when did the land before time movies come out
[{'answer': '1988', 'provenance': [{'wikipedia_id': '10635704', 'title': 'The Land Before Time (franchise)', 'start_paragraph_id': 1, 'start_character': 140, 'end_paragraph_id': 1, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10635704', 'title': 'The Land Before Time (franchise)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 587, 'bleu_score': 0.952657101209585, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11382737408088734589}, 'section': 'Section::::Abstract.'}]}]