Question: when did the san francisco mint stop making circulating coins
[{'answer': '1937', 'provenance': [{'wikipedia_id': '2625463', 'title': 'San Francisco Mint', 'start_paragraph_id': 1, 'start_character': 388, 'end_paragraph_id': 1, 'end_character': 392, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2625463', 'title': 'San Francisco Mint', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 430, 'bleu_score': 0.97451705556073, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13117909948263698536}, 'section': 'Section::::Abstract.'}]}]