Question: when was the last nuclear power plant built in the us
[{'answer': 'October 19 , 2016', 'provenance': [{'wikipedia_id': '4131402', 'title': 'Nuclear power in the United States', 'start_paragraph_id': 4, 'start_character': 886, 'end_paragraph_id': 4, 'end_character': 906, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4131402', 'title': 'Nuclear power in the United States', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1036, 'bleu_score': 0.8955782156713431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1929922677700692245}, 'section': 'Section::::Abstract.'}]}]