Question: when was the last time nsw won the state of origin series
[{'answer': '2018', 'provenance': [{'wikipedia_id': '1954843', 'title': 'State of Origin series', 'start_paragraph_id': 52, 'start_character': 3, 'end_paragraph_id': 52, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::History.:2010s.\n'}]}]