Question: when was the last time portugal won the eurovision
[{'answer': '2017', 'provenance': [{'wikipedia_id': '4760925', 'title': 'Portugal in the Eurovision Song Contest', 'start_paragraph_id': 12, 'start_character': 430, 'end_paragraph_id': 12, 'end_character': 434, 'bleu_score': 1.0, 'section': 'Section::::Festival da Canção.\n'}]}]