Question: when did the united states get off the gold standard
[{'answer': '30 January 1934', 'provenance': [{'wikipedia_id': '37412', 'title': 'Gold standard', 'start_paragraph_id': 58, 'start_character': 40, 'end_paragraph_id': 58, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abandonment of the gold standard.:Depression and World War II.:Great Depression.\n'}]}, {'provenance': [{'wikipedia_id': '37412', 'title': 'Gold standard', 'start_paragraph_id': 58, 'start_character': 0, 'end_paragraph_id': 58, 'end_character': 521, 'bleu_score': 0.977897140678983, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9393354220986337950}, 'section': 'Section::::Abandonment of the gold standard.:Depression and World War II.:Great Depression.\n'}]}]