Question: when was machu picchu listed as a world heritage site
[{'answer': '1983', 'provenance': [{'wikipedia_id': '28875392', 'title': 'List of World Heritage Sites in Peru', 'start_paragraph_id': 2, 'start_character': 182, 'end_paragraph_id': 2, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28875392', 'title': 'List of World Heritage Sites in Peru', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 546, 'bleu_score': 0.6785065080527061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5896878301465903499}, 'section': 'Section::::Abstract.'}]}]