Question: when was yosemite made a world heritage site
[{'answer': '1984', 'provenance': [{'wikipedia_id': '48664', 'title': 'Yosemite National Park', 'start_paragraph_id': 1, 'start_character': 449, 'end_paragraph_id': 1, 'end_character': 453, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '48664', 'title': 'Yosemite National Park', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 677, 'bleu_score': 0.7846363483413691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15920587838685164781}, 'section': 'Section::::Abstract.'}]}]