Question: When did the currencies of the country where the town of Gurúè is located, first come into circulation?

full_context: Document 1: 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 2: 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 3: 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 4: 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 5: Gurúè: Gurúè (also spelt Gurué; known before independence as Vila Junqueiro) is a town located in the northern part of Mozambique, near the center of the province of Zambezia. It serves as the principal town of Gurué District, and is Mozambique's largest tea estate. According to the 2007 census, the town had a population of 145,466, an increase from the 99,335 inhabitants counted in the 1997 census.
Document 6: Báruè District: Báruè District is a district of Manica Province in western Mozambique. Its principal town is Catandica. The district is located in the west of the province, and borders with Guro District in the north, Macossa District in the east, Gondola District in the southeast, Manica District in the south, and with Zimbabwe in the west. The area of the district is . It has a population of 137,582 as of 2007.
Document 7: 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 8: Catandica: Catandica (before independence known as Vila Gouveia) is a town located in the province of Manica in Mozambique. It is the administrative center of Báruè District. As of 2008 it had a population of 29 052.
Document 9: Gwembe: Gwembe is a small town in Southern Province of Zambia with a population of about 2000 people. It is the largest town in Gwembe District which on Lake Kariba between Siavonga and Sinazongwe Districts. It used to be the District Headquarters until it moved to Munyumbwe some 30 km east of the town.
Document 10: Chicualacuala: Chicualacuala is a town located in the province of Gaza in Mozambique. The town is better known by this unofficial name (and the name of the district to which the town belongs) than by its official toponym Vila Eduardo Mondlane.
Document 11: Guijá District: Guijá District is a district of Gaza Province in south-western Mozambique. The administrative center of the district is Caniçado. The district is located at the south of the province, and borders with Chigubo District in the north, Chibuto District in the east, Chókwè District in the south, and with Mabalane District in the west. The area of the district is . It has a population of 75,303 as of 2007.
Document 12: 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 13: Guruve District: Guruve is one of several districts in the Mashonaland Central province of Zimbabwe. The district capital is the town of Guruve.
Document 14: 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 15: 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.
ground_truth: 16 June 1980
sub_queries: Gurúè >> country Answer: Mozambique
when did the currencies of Mozambique first come in circulation Answer: 16 June 1980