Question: Removed from circulation in 1999, the fillér was the Hungartian subunit of what Austro-Hungarian currency?

full_context: Document 1: Hungarian forint: The forint (sign: Ft; code: HUF) is the currency of Hungary. It was formerly divided into 100 fillér, but fillér coins are no longer in circulation. The introduction of the forint on 1 August 1946 was a crucial step in the post-World War II stabilization of the Hungarian economy, and the currency remained relatively stable until the 1980s. Transition to a market economy in the early 1990s adversely affected the value of the forint; inflation peaked at 35% in 1991. Since 2001, inflation is in single digits, and the forint has been declared fully convertible. As a member of the European Union, the long -term aim of the Hungarian government may be to replace the forint with the euro, but that does not appear to be likely until some time during the 2020s.
Document 2: Kingdom of Croatia (Habsburg): The Kingdom of Croatia (Croatian: "Kraljevina Hrvatska"; Latin: "Regnum Croatiae" Hungarian: "Horvát Királyság" German: "Königreich Kroatien" ) was an administrative division that existed between 1527 and 1868 within the Habsburg Monarchy (also known between 1804 and 1867 as the Austrian Empire). The Kingdom was a part of the Lands of the Crown of St. Stephen, but was subject to direct Imperial Austrian rule for significant periods of time, including its final years. Its capital was Zagreb.
Document 3: German gold mark: The Goldmark (   ; officially just "Mark", sign: ℳ) was the currency used in the German Empire from 1873 to 1914. The Papiermark refers to the German currency from 4 August 1914 when the link between the Mark and gold was abandoned.
Document 4: German Papiermark: The name Papiermark (   ; English: "paper mark" , officially just "Mark", sign: ℳ) is applied to the German currency from 4 August 1914 when the link between the Goldmark and gold was abandoned, due to the outbreak of World War I. In particular, the name is used for the banknotes issued during the hyperinflation in Germany of 1922 and especially 1923.
Document 5: Reichsmark: The Reichsmark (] ; sign: ℛℳ) was the currency in Germany from 1924 until 20 June 1948 in West Germany, where it was replaced with the Deutsche Mark, and until 23 June in East Germany when it was replaced by the East German mark. The Reichsmark was subdivided into 100 "Reichspfennig". The Mark is an ancient Germanic weight measure, traditionally a half pound, later used for several coins; whereas "Reich", that is "realm" in English, comes from the official name for the German nation state from 1871 to 1943, Deutsches Reich.
Document 6: Maria Theresa thaler: The Maria Theresa thaler (MTT) is a silver bullion coin that has been used in world trade continuously since they were first minted in 1741, at that time using the then Reichsthaler standard of 9 thalers to the Vienna mark. In 1750 the thaler was debased to 10 thalers to the Vienna Mark (a weight approximating half a pound of fine silver). The following year the new standard was effectively adopted across the German-speaking world when that standard was accepted formally in the Bavarian monetary convention. It is owing to the date of the Bavarian Monetary convention that many writers erroneously state that the Maria Theresa Thaler was first struck in 1751. It was named after Empress Maria Theresa, who ruled Austria, Hungary, and Bohemia from 1740 to 1780. The word "thaler" gave rise to "daalder" and "daler", which became "dollar" in English.
Document 7: Twenty-five cent coin (Netherlands): The twenty-five cent was a coin worth a quarter of decimal Dutch guilder. It was used from the decimalisation of the currency in 1817 until the Netherlands adopted the euro as sole currency in 2002. The last minting was in 2002. The coin was the third-smallest denomination of the guilder when the currency was withdrawn, and the largest of a value less than one guilder.
Document 8: Fillér: The fillér ] was the name of various small change coins throughout Hungarian history. It was the ⁄ subdivision of the Austro-Hungarian and the Hungarian korona, the pengő and the forint. The name derives from the German word "Vierer" that means "number four" in English. Originally it was the name of the four-kreuzer coin. Due to significant inflation that took place after the fall of communism, fillér coins are no longer in circulation. The last fillér coin, worth 50 fillér (0.5 forint) was removed from circulation in 1999. However, it continues to be used in calculations, for example in the price of petrol (e.g. 310.9 forint), or in the prices of telephone calls.
Document 9: Austro-Hungarian gulden: The Gulden or forint (German: "Gulden" , Hungarian: "forint" , Croatian: "forinta/florin" , Czech: "zlatý" ) was the currency of the lands of the House of Habsburg between 1754 and 1892 (known as the Austrian Empire from 1804 to 1867 and the Austro-Hungarian Monarchy after 1867), when it was replaced by the Krone/korona as part of the introduction of the gold standard. In Austria, the Gulden was initially divided into 60 Kreuzer, and in Hungary, the forint was divided into 60 krajczár. The currency was decimalized in 1857, using the same names for the unit and subunit.
Document 10: Hong Kong one-mil coin: The one mil coin was the smallest denomination of the Hong Kong dollar from 1863 to 1866, after this date it was no longer issued but may have circulated much longer. Its value was one tenth of a cent, or a thousandth of a dollar. Despite being minted under British rule, they did not feature the reigning monarch as all other coins did, due to the hole in the middle.
Document 11: Austro-Hungarian krone: The Krone or korona (German: "Krone" , Hungarian: "korona" , , Czech and Slovak: "koruna" ) was the official currency of the Austro-Hungarian Empire from 1892 (when it replaced the gulden, forint, florén or zlatka as part of the adoption of the gold standard) until the dissolution of the empire in 1918. The subunit was one hundredth of the main unit, and was called a "Heller " in the Austrian and a "fillér " (or "halier " in Slovak and "haléř" in Czech) in the Hungarian part of the Empire.
Document 12: Austria-Hungary: Austria-Hungary, often referred to as the Austro-Hungarian Empire or the Dual Monarchy in English-language sources, was a constitutional union of the Austrian Empire (the Kingdoms and Lands Represented in the Imperial Council, or "Cisleithania") and the Kingdom of Hungary (Lands of the Crown of Saint Stephen or "Transleithania") that existed from 1867 to 1918, when it collapsed as a result of defeat in World War I. The union was a result of the Austro-Hungarian Compromise of 1867 and came into existence on 30 March 1867. Austria-Hungary consisted of two monarchies (Austria and Hungary), and one autonomous region: the Kingdom of Croatia-Slavonia under the Hungarian crown, which negotiated the Croatian–Hungarian Settlement ("Nagodba") in 1868. It was ruled by the House of Habsburg, and constituted the last phase in the constitutional evolution of the Habsburg Monarchy. Following the 1867 reforms, the Austrian and the Hungarian states were co-equal. Foreign affairs and the military came under joint oversight, but all other governmental faculties were divided between respective states.
Document 13: Habsburg Monarchy: The Habsburg Monarchy (German: "Habsburgermonarchie" ) or Empire, is an unofficial appellation among historians for the countries and provinces that were ruled by the between 1521 and 1780 and then by the successor branch of Habsburg-Lorraine until 1918. The Monarchy was a composite state composed of territories within and outside the Holy Roman Empire, united only in the person of the monarch. The dynastic capital was Vienna, except from 1583 to 1611, when it was moved to Prague. From 1804 to 1867 the Habsburg Monarchy was formally unified as the Austrian Empire, and from 1867 to 1918 as the Austro-Hungarian Empire.
Document 14: Half-cent coin (Netherlands): The half-cent coin was a Dutch coin used from 1818 to 1940. It was the smallest-denomination coin of the decimal Dutch guilder until its withdrawal from circulation after the German occupation of the Netherlands in 1940. It was nicknamed "Halfje", similar to the Kwartje (the suffix "-je" is a diminutive in the Dutch language, similar to the English "-ie").
Document 15: Kingdom of Croatia-Slavonia: The Kingdom of Croatia-Slavonia (Croatian: "Kraljevina Hrvatska i Slavonija" ; Hungarian: "Horvát-Szlavón Királyság" ; German: "Königreich Kroatien und Slawonien" ) was a nominally autonomous kingdom within the Austro-Hungarian Empire, created in 1868 by merging the kingdoms of Croatia and Slavonia following the Croatian–Hungarian Settlement. It was associated with the Hungarian Kingdom within the dual Austro-Hungarian state, being within the Lands of the Crown of St. Stephen or Transleithania. The kingdom was ruled by the Habsburg Emperor-King of Austria-Hungary ("Kaiser und König") under his title as "King of Croatia and Slavonia". The King's appointed steward was the Ban of Croatia and Slavonia. Although it was under the suzerainty of the Crown of Saint Stephen, the Kingdom of Croatia and Slavonia kept a significant level of self-rule.
ground_truth: The Krone