Question: when was the last time the world series was swept
[{'answer': '2012', 'provenance': [{'wikipedia_id': '23489161', 'title': 'World Series', 'start_paragraph_id': 38, 'start_character': 438, 'end_paragraph_id': 38, 'end_character': 442, 'bleu_score': 1.0, 'section': 'Section::::Modern World Series (1903–present).:The World Series in California.\n'}]}, {'provenance': [{'wikipedia_id': '23489161', 'title': 'World Series', 'start_paragraph_id': 117, 'start_character': 0, 'end_paragraph_id': 117, 'end_character': 1048, 'bleu_score': 0.802050935860612, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14066620628585488684}, 'section': 'Section::::Modern World Series appearances by franchise.:Team patterns in the World Series.:Game-by-game.\n'}]}]