Question: When did the currencies of the country Ibo is located first come into circulation?

full_context: Document 1: Spanish peseta: The peseta was replaced by the euro in 2002, following the establishment of the euro in 1999. The exchange rate was 1 euro = 166.386 pesetas.
Document 2: Colombo: As Colombo possesses a natural harbour, it was known to Indian, Greek, Persian, Roman, Arab, and Chinese traders over 2,000 years ago. Traveller Ibn Battuta who visited the island in the 14th century, referred to it as Kalanpu. Arabs, whose prime interests were trade, began to settle in Colombo around the 8th century AD mostly because the port helped their business by the way of controlling much of the trade between the Sinhalese kingdoms and the outside world. Their descendants now comprise the local Sri Lankan Moor community.
Document 3: Coins of the Indian rupee: The move towards decimalization was afoot for over a century. However, it was in September, 1955 that the Indian Coinage Act was amended for the country to adopt a metric system for coinage. The Act came into force with effect from 1 April 1957, after which anna and pice denominations were demonetised. The rupee remained unchanged in value and nomenclature. It, however, was now divided into 100 'paisa' instead of 16 annas or 64 pice. Effective from 30 June 2011, all coins in denominations of 25 paisa and below were officially demonetized.
Document 4: Chibuene: Chibuene is a Mozambiquean archaeological site, located five kilometres south of the coastal city of Vilanculos South Beach. The site was occupied during two distinct phases. The earlier phase of occupation dates to the late first millennium AD. The second phase dates from around 1450 and is contemporaneous with the Great Zimbabwe civilization in the African interior. During both phases of its development Chibuene was a trading settlement. Trade goods obtained from the site include glass beads, painted blue and white ceramics, and glass bottle fragments. The later phase of settlement has yielded remains of ancient structures as well as evidence of metallurgy. Crucibles have been found that were presumably used to melt gold obtained from trade with the Great Zimbabwe civilization. There is evidence that Chibuene traded extensively with the inland settlement of Manyikeni. Mozambique has jointly inscribed these two properties on their tentative version of the World Heritage List.
Document 5: Euro: The changeover period during which the former currencies' notes and coins were exchanged for those of the euro lasted about two months, until 28 February 2002. The official date on which the national currencies ceased to be legal tender varied from member state to member state. The earliest date was in Germany, where the mark officially ceased to be legal tender on 31 December 2001, though the exchange period lasted for two months more. Even after the old currencies ceased to be legal tender, they continued to be accepted by national central banks for periods ranging from several years to indefinitely (the latter for Austria, Germany, Ireland, Estonia and Latvia in banknotes and coins, and for Belgium, Luxembourg, Slovenia and Slovakia in banknotes only). The earliest coins to become non-convertible were the Portuguese escudos, which ceased to have monetary value after 31 December 2002, although banknotes remain exchangeable until 2022.
Document 6: Ibo (Mozambique): Ibo is one of the Quirimbas Islands in the Indian Ocean off northern Mozambique. It is part of Cabo Delgado Province. It grew as a Muslim trading port. Vasco da Gama reportedly rested on the island in 1502. The island was fortified in 1609 by the Portuguese.
Document 7: Cape Verdean escudo: In mid-1998 an agreement with Portugal established a pegged rate of 1 Portuguese escudo = 0.55 Cape Verdean escudo. Since the replacement of the Portuguese escudo with the euro, the Cape Verdean escudo has been pegged to the euro at a rate of 1 EUR = 110.265 CVE. This peg is supported by a credit facility from the Portuguese government.
Document 8: Mozambique: Mozambique (), officially the Republic of Mozambique ( or "", , , , ), is a country located in Southeast Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west, and Eswatini (Swaziland) and South Africa to the southwest. The sovereign state is separated from the Comoros, Mayotte and Madagascar by the Mozambique Channel to the east. The capital of Mozambique is Maputo (formerly known as "Lourenço Marques" from 1876 to 1976) while Matola is the largest city, being a suburb of Maputo.
Document 9: Kizimkazi Mosque: The Kizimkazi Mosque is a mosque situated on the southern tip of the island of Zanzibar in Tanzania and is one of the oldest Islamic buildings on the East African coast. Despite its name, it is located in Dimbani, not Kizimkazi, which is away (this is because the official names of these two joined villages are Kizimkazi Dimbani and Kizimkazi Mtendeni). According to a preserved kufic inscription, it was built in 1107 by settlers from Shiraz. Although the inscription and certain coral-carved decorative elements date from the period of construction, the majority of the present structure was rebuilt in the 18th century.
Document 10: Cape Verdean escudo: After independence on 5 July 1975, notes were issued for 100, 500, and 1000 escudos on 1 July 1977. The next series of notes was introduced in 1989 and consisted of 100, 200, 500, 1000 and 2500 escudos.
Document 11: Mozambican metical: The metical (MZM) replaced the escudo at par on 16 June 1980. It was divided into 100 centavos. The metical underwent severe inflation. After the revaluation of the Romanian leu, the metical briefly became the least valued currency unit, at a value of about 24,500 meticais per USD, until the Zimbabwean dollar took the title in late August 2005.
Document 12: Zimbabwean dollar: The first Zimbabwean dollar was introduced in 1980 and replaced the Rhodesian dollar at par. The initial ISO 4217 code was ZWD. At the time of its introduction, the Zimbabwean dollar was worth more than the US dollar in the official exchange market, with 1 ZWD = 1.47 USD, although this did not reflect the actual purchasing power it held. As a result, in both the official and parallel markets, the currency's value eroded rapidly over the years, and by July 2006, the parallel market value of the Zimbabwean dollar fell to Z $1,000,000 = GB £1.
Document 13: Pemba, Mozambique: Pemba is a port city in Mozambique. It is the capital of the province of Cabo Delgado and lies on a peninsula in Pemba Bay.
Document 14: Palma, Mozambique: Palma is a town on the Indian Ocean coast of Mozambique, lying south of the border with Tanzania. It is known for basketry, for rugmaking and for its offshore islands. It is likely that Palma will become the base of LNG, liquified natural gas, operations for the fast evolving offshore Mozambique natural gas industry.
Document 15: History of Bombay under Portuguese rule (1534–1661): Bombay, now called Mumbai, Bombaim in Portuguese, is the financial and commercial capital of India and one of the most populous cities in the world. At the time of arrival of the Portuguese, current Bombay was an archipelago of seven islands. Between the third century BCE and 1348, the islands came under the control of successive Hindu dynasties. The Muslim rulers of Gujarat, who had been ruling current Thane and Vasai for a few decades, annexed the islands in 1348, that were later governed by the Gujarat Sultanate from 1391 to 1534. Growing apprehensive of the power of the Mughal emperor Humayun, Sultan Bahadur Shah of the Gujarat Sultanate was obliged to sign the Treaty of Bassein with the Portuguese Empire on 23 December 1534. According to the treaty, the seven islands of Bombay, the nearby strategic town of Bassein and its dependencies were offered to the Portuguese. The territories were later surrendered on 25 October 1535.
ground_truth: 16 June 1980
sub_queries: Ibo >> country Answer: Mozambique
when did the currencies of Mozambique first come in circulation Answer: 16 June 1980