Question: when did the occupation of the ruhr end
[{'answer': '1925', 'provenance': [{'wikipedia_id': '1607008', 'title': 'Occupation of the Ruhr', 'start_paragraph_id': 1, 'start_character': 152, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]