Question: when did andres iniesta start playing for barcelona
[{'answer': '2002', 'provenance': [{'wikipedia_id': '2437065', 'title': 'Andrés Iniesta', 'start_paragraph_id': 2, 'start_character': 181, 'end_paragraph_id': 2, 'end_character': 185, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]