Question: when did unesco declared paharpur as a world heritage area
[{'answer': '1985', 'provenance': [{'wikipedia_id': '12694418', 'title': 'Somapura Mahavihara', 'start_paragraph_id': 1, 'start_character': 297, 'end_paragraph_id': 1, 'end_character': 301, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12694418', 'title': 'Somapura Mahavihara', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 433, 'bleu_score': 0.9385658427564221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7139813959176120989}, 'section': 'Section::::Abstract.'}]}]