Question: when was 500 rupee note introduced in pakistan
[{'answer': '1986', 'provenance': [{'wikipedia_id': '588111', 'title': 'Pakistani rupee', 'start_paragraph_id': 13, 'start_character': 398, 'end_paragraph_id': 13, 'end_character': 402, 'bleu_score': 1.0, 'section': 'Section::::Banknotes.\n'}]}, {'provenance': [{'wikipedia_id': '588111', 'title': 'Pakistani rupee', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 825, 'bleu_score': 0.969191309144216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10054178841138571383}, 'section': 'Section::::Banknotes.\n'}]}]