Question: when was the last time real madrid won la liga title
[{'answer': '2017'}, {'provenance': [{'wikipedia_id': '20302096', 'title': 'List of Spanish football champions', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 657, 'bleu_score': 0.7018656155960381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17017369961399404545}, 'section': 'Section::::Abstract.'}]}]