Question: Before the Euro, what was the currency in the happiest country in the world 2018?

full_context: Document 1: Nigerian naira: The naira was introduced on 1 January 1973, replacing the pound at a rate of 2 naira = 1 pound. This made Nigeria the last country to abandon the £sd currency system. There was a plan to redenominate the naira at 1 new naira = 100 old naira in 2008, but the plan was suspended. The currency sign is U + 20A6 ₦Naira sign.
Document 2: 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 3: Mercer Quality of Living Survey: The Mercer Quality of Living Survey ranks 231 cities from Vienna to Baghdad on quality of life. Countries with cities commonly ranked in the top 50 include Austria, Switzerland, New Zealand, Germany, Canada, Denmark, Finland, Australia, Sweden and the United States. Vienna has been ranked first for eight consecutive years.
Document 4: Human Development Index: The list below displays the top-ranked country from each year of the Human Development Index. Norway has been ranked the highest twelve times, Canada eight times, followed by Japan which has been ranked highest three times. Iceland has been ranked highest twice.
Document 5: Netherlands: Amsterdam is the financial and business capital of the Netherlands. The Amsterdam Stock Exchange (AEX), part of Euronext, is the world's oldest stock exchange and is one of Europe's largest bourses. It is situated near Dam Square in the city's centre. As a founding member of the euro, the Netherlands replaced (for accounting purposes) its former currency, the "gulden" (guilder), on 1 January 1999, along with 15 other adopters of the euro. Actual euro coins and banknotes followed on 1 January 2002. One euro was equivalent to 2.20371 Dutch guilders. In the Caribbean Netherlands, the United States dollar is used instead of the euro.
Document 6: 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 7: Economic inequality: British researchers Richard G. Wilkinson and Kate Pickett have found higher rates of health and social problems (obesity, mental illness, homicides, teenage births, incarceration, child conflict, drug use), and lower rates of social goods (life expectancy by country, educational performance, trust among strangers, women's status, social mobility, even numbers of patents issued) in countries and states with higher inequality. Using statistics from 23 developed countries and the 50 states of the US, they found social/health problems lower in countries like Japan and Finland and states like Utah and New Hampshire with high levels of equality, than in countries (US and UK) and states (Mississippi and New York) with large differences in household income.
Document 8: Human Development Index: The 2009 Human Development Report by UNDP was released on October 5, 2009, and covers the period up to 2007. It was titled "Overcoming barriers: Human mobility and development". The top countries by HDI were grouped in a new category called "very high human development". The report refers to these countries as developed countries. They are:
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: Switzerland: Switzerland is one of the richest and wealthiest countries in the world. Switzerland ranks top or close to the top in several metrics of national performance, including government transparency, civil liberties, quality of life, economic competitiveness, and human development. It has the highest nominal wealth (financial and non-financial assets) per adult in the world according to Credit Suisse and the eighth-highest per capita gross domestic product on the IMF list. Zürich and Geneva have each been ranked among the top cities with the highest quality of life in the world, with the former ranked 2nd globally, according to Mercer.
Document 11: World Happiness Report: The 2018 reiteration was released on 14 March and focused on the relation between happiness and migration. As per 2018 Happiness Report, Finland is the happiest country in the world, with Norway, Denmark, Iceland, and Switzerland holding the next top positions. The World Happiness Report 2018 ranks 156 countries by their happiness levels, and 117 countries by the happiness of their immigrants. The main focus of this year's report, in addition to its usual ranking of the levels and changes in happiness around the world, is on migration within and between countries. The overall rankings of country happiness are based on the pooled results from Gallup World Poll surveys from 2015 -- 2017, and show both change and stability. Four countries have held the top spot in the last four reports: Denmark, Switzerland, Norway and now Finland. All the top countries tend to have high values for all six of the key variables that have been found to support well - being: income, healthy life expectancy, social support, freedom, trust and generosity. Among the top countries, differences are small enough that year - to - year changes in the rankings are to be expected.
Document 12: Currency of Ecuador: The US dollar became legal tender in Ecuador March 13, 2000, and sucre notes ceased being legal tender on September 11. Sucre notes remained exchangeable at Banco Central until March 30, 2001, at 25,000 sucres per dollar. Ecuador now only issues its own centavo coins.
Document 13: Human Development Index: Countries in the top quartile of HDI ("very high human development" group) with a missing IHDI: New Zealand, Singapore, Hong Kong, Liechtenstein, Brunei, Qatar, Saudi Arabia, Andorra, United Arab Emirates, Bahrain, Cuba, and Kuwait.
Document 14: Economy of Greece: Between 1832 and 2002 the currency of Greece was the drachma. After signing the Maastricht Treaty, Greece applied to join the eurozone. The two main convergence criteria were a maximum budget deficit of 3% of GDP and a declining public debt if it stood above 60% of GDP. Greece met the criteria as shown in its 1999 annual public account. On 1 January 2001, Greece joined the eurozone, with the adoption of the euro at the fixed exchange rate ₯340.75 to €1. However, in 2001 the euro only existed electronically, so the physical exchange from drachma to euro only took place on 1 January 2002. This was followed by a ten-year period for eligible exchange of drachma to euro, which ended on 1 March 2012.
Document 15: Finnish markka: The Finnish markka (Finnish: Suomen markka, abbreviated mk, Swedish: finsk mark, currency code: FIM) was the currency of Finland from 1860 until 28 February 2002, when it ceased to be legal tender. The markka was replaced by the euro (€), which had been introduced, in cash form, on 1 January 2002, after a transitional period of three years when the euro was the official currency but only existed as' book money '. The dual circulation period -- when both the Finnish markka and the euro had legal tender status -- ended on 28 February 2002.
ground_truth: The Finnish markka
sub_queries: the most happy country in the world 2018 Answer: Finland
what was Finland 's currency before the euro Answer: The Finnish markka