Question: when did the liberals take power in canada
[{'answer': '2015', 'provenance': [{'wikipedia_id': '149536', 'title': 'Liberal Party of Canada', 'start_paragraph_id': 4, 'start_character': 7, 'end_paragraph_id': 4, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]