Question: when did the five day work week start
[{'answer': '1940', 'provenance': [{'wikipedia_id': '2016347', 'title': 'Workweek and weekend', 'start_paragraph_id': 11, 'start_character': 491, 'end_paragraph_id': 11, 'end_character': 495, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2016347', 'title': 'Workweek and weekend', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 653, 'bleu_score': 0.8913425428591251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9649769571561275495}, 'section': 'Section::::History.\n'}]}]