Question: when was the great sand dunes national park established
[{'answer': 'September 24 , 2004', 'provenance': [{'wikipedia_id': '465511', 'title': 'Great Sand Dunes National Park and Preserve', 'start_paragraph_id': 73, 'start_character': 108, 'end_paragraph_id': 73, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Designations.\n'}]}, {'provenance': [{'wikipedia_id': '465511', 'title': 'Great Sand Dunes National Park and Preserve', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 745, 'bleu_score': 0.661322243739169, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8374280841002232550}, 'section': 'Section::::Abstract.'}]}]