Question: how many grand slam finals has andy murray lost
[{'answer': '8', 'provenance': [{'wikipedia_id': '24249673', 'title': 'Andy Murray career statistics', 'start_paragraph_id': 1, 'start_character': 386, 'end_paragraph_id': 1, 'end_character': 387, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]