Question: when did the currencies of mozambique first come in circulation
[{'answer': '16 June 1980', 'provenance': [{'wikipedia_id': '1812237', 'title': 'Mozambican metical', 'start_paragraph_id': 5, 'start_character': 50, 'end_paragraph_id': 5, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::History.:First metical (MZM).\n'}]}, {'provenance': [{'wikipedia_id': '1812237', 'title': 'Mozambican metical', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 359, 'bleu_score': 0.912639856485654, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15454503486351740683}, 'section': 'Section::::History.:First metical (MZM).\n'}]}]