Question: when was the last time the united kingdom won the eurovision song contest
[{'answer': '1997', 'provenance': [{'wikipedia_id': '17766232', 'title': 'United Kingdom in the Eurovision Song Contest', 'start_paragraph_id': 10, 'start_character': 1629, 'end_paragraph_id': 10, 'end_character': 1633, 'bleu_score': 1.0, 'section': 'Section::::History.:1980s and 1990s.\n'}]}]