Question: when was islamic banking system introduced in pakistan
[{'answer': 'January 1 , 1980', 'provenance': [{'wikipedia_id': '36700443', 'title': 'Islamic economics in Pakistan', 'start_paragraph_id': 28, 'start_character': 3, 'end_paragraph_id': 28, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Policies and difficulties.:Banning "Riba", building Islamic banking.\n'}]}, {'provenance': [{'wikipedia_id': '36700443', 'title': 'Islamic economics in Pakistan', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 566, 'bleu_score': 0.9776501033621461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13766335929468610039}, 'section': 'Section::::Abstract.'}]}]