Question: who has the worst plus minus in nhl
[{'answer': 'Bob Stewart', 'provenance': [{'wikipedia_id': '434842', 'title': 'Plus-minus', 'start_paragraph_id': 32, 'start_character': 12, 'end_paragraph_id': 32, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Notable players (NHL).\n'}]}, {'provenance': [{'wikipedia_id': '434842', 'title': 'Plus-minus', 'start_paragraph_id': 32, 'start_character': 0, 'end_paragraph_id': 32, 'end_character': 36, 'bleu_score': 0.5081327481546141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11923421708957729318}, 'section': 'Section::::Notable players (NHL).\n'}]}]