Question: when did the fed start using open market operations
[{'answer': '1961', 'provenance': [{'wikipedia_id': '15513110', 'title': 'History of Federal Open Market Committee actions', 'start_paragraph_id': 3, 'start_character': 28, 'end_paragraph_id': 3, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Famous actions.\n'}]}, {'provenance': [{'wikipedia_id': '15513110', 'title': 'History of Federal Open Market Committee actions', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1287, 'bleu_score': 0.9906320603853681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1557513093815348633}, 'section': 'Section::::Famous actions.:Operation Twist (1961).\n'}]}]