Question: when did gates of the arctic become a national park
[{'answer': '1980', 'provenance': [{'wikipedia_id': '619313', 'title': 'Gates of the Arctic National Park and Preserve', 'start_paragraph_id': 1, 'start_character': 552, 'end_paragraph_id': 1, 'end_character': 556, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '619313', 'title': 'Gates of the Arctic National Park and Preserve', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 782, 'bleu_score': 0.533454265335572, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16225275567208496141}, 'section': 'Section::::Abstract.'}]}]