Question: when did canada get rid of the penny
[{'answer': 'May 2012', 'provenance': [{'wikipedia_id': '1560173', 'title': 'Penny (Canadian coin)', 'start_paragraph_id': 3, 'start_character': 34, 'end_paragraph_id': 3, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1560173', 'title': 'Penny (Canadian coin)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 479, 'bleu_score': 0.941591348007749, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17669942128249012592}, 'section': 'Section::::Abstract.'}]}]