Question: when did adam smith published the wealth of nations
[{'answer': '1776', 'provenance': [{'wikipedia_id': '725991', 'title': 'The Wealth of Nations', 'start_paragraph_id': 1, 'start_character': 232, 'end_paragraph_id': 1, 'end_character': 236, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '725991', 'title': 'The Wealth of Nations', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 567, 'bleu_score': 0.978606533029418, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16005900706827782754}, 'section': 'Section::::Abstract.'}]}]