Question: when was the occupational health and safety act established
[{'answer': 'December 29 , 1970', 'provenance': [{'wikipedia_id': '461036', 'title': 'Occupational Safety and Health Act (United States)', 'start_paragraph_id': 11, 'start_character': 918, 'end_paragraph_id': 11, 'end_character': 936, 'bleu_score': 1.0, 'section': 'Section::::Passage.\n'}]}, {'provenance': [{'wikipedia_id': '461036', 'title': 'Occupational Safety and Health Act (United States)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 670, 'bleu_score': 0.9812185674664711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5333191956246751575}, 'section': 'Section::::Abstract.'}]}]