Question: when did the great sand dunes become a national park
[{'answer': '2000 - 2004', 'provenance': [{'wikipedia_id': '465511', 'title': 'Great Sand Dunes National Park and Preserve', 'start_paragraph_id': 68, 'start_character': 393, 'end_paragraph_id': 68, 'end_character': 403, 'bleu_score': 1.0, 'section': 'Section::::Designations.\n'}]}, {'provenance': [{'wikipedia_id': '465511', 'title': 'Great Sand Dunes National Park and Preserve', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 602, 'bleu_score': 0.9804854598160591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14142967408765335992}, 'section': 'Section::::History.:Preservation.\n'}]}]