Question: when did bryce canyon became a national park
[{'answer': '1928', 'provenance': [{'wikipedia_id': '46991', 'title': 'Bryce Canyon National Park', 'start_paragraph_id': 2, 'start_character': 311, 'end_paragraph_id': 2, 'end_character': 315, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46991', 'title': 'Bryce Canyon National Park', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 646, 'bleu_score': 0.892538572958909, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7741524621083102889}, 'section': 'Section::::Abstract.'}]}]