Question: when was the last time ireland won grand slam
[{'answer': '2018'}, {'provenance': [{'wikipedia_id': '3933705', 'title': 'Grand Slam (rugby union)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 425, 'bleu_score': 0.9188480019270161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3989173164770675246}, 'section': 'Section::::Abstract.'}]}]