Question: when was the taj mahal declared a wonder of the world
[{'answer': '2007', 'provenance': [{'wikipedia_id': '82976', 'title': 'Taj Mahal', 'start_paragraph_id': 3, 'start_character': 349, 'end_paragraph_id': 3, 'end_character': 353, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '82976', 'title': 'Taj Mahal', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 434, 'bleu_score': 0.877770116632918, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13156506619418322574}, 'section': 'Section::::Abstract.'}]}]