Question: When did the currencies of the country where the Changane River is located first come into circulation?

full_context: Document 1: 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 2: Canje River: The Canje River, located in northeastern Guyana, is the main tributary of the Berbice River. It runs roughly parallel to the Atlantic Ocean coast.
Document 3: Shashe River: The Shashe River (or Shashi River) is a major left-bank tributary of the Limpopo River in Zimbabwe. It rises northwest of Francistown, Botswana and flows into the Limpopo River where Botswana, Zimbabwe and South Africa meet.
Document 4: Bilene: Bilene, also known as Praia do Bilene, is a town in southern Mozambique, lying 140 kilometres northeast of Maputo in the province of Gaza. It is known as a beach resort, lying on the Mozambique Channel. Noted for its calm and clear lagoon, the Uembje Lagoon, giving way to the pounding Indian Ocean beyond tall dunes, it is reported to be the closest beach destination to the city of Johannesburg in neighboring South Africa.
Document 5: 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 6: Chitake River: The Chitake River flows through the Mana Pools National Park, Zimbabwe, and has its source in the Zambezi Escarpment. The source is a perennial spring at the foothills, which flows for 1 kilometre within the canyon walls. The river discharges into the Rukomechi River.
Document 7: 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 8: Salvadoran colón: The colón was the currency of El Salvador between 1892 and 2001, until it was replaced by the U.S. Dollar. It was subdivided into 100 centavos and its ISO 4217 code was SVC. The plural is colones in Spanish and was named after Christopher Columbus, known as Cristóbal Colón in Spanish.
Document 9: 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 10: 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 11: Changane River: The Changane River () is a river in Mozambique, a tributary to the Limpopo River which it joins near the coast, just past the town of Chibuto. It forms part of the eastern boundary of Gaza Province. The Changane is the easternmost tributary of the Limpopo, entering it from the left near its mouth on the Indian Ocean
Document 12: Umchabezi River: The Umchabezi River is a tributary of the Mzingwane River in Beitbridge District and Gwanda District, Zimbabwe. The main dam on the river is Makado Dam, which supplies water for commercial irrigation.
Document 13: 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 14: 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 15: 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.
ground_truth: 16 June 1980
sub_queries: Changane River >> country Answer: Mozambique
when did the currencies of Mozambique first come in circulation Answer: 16 June 1980