Question: What quantity of oil are in the reserves of the country that used to be called Persia?

full_context: Document 1: Iran: Iran has the second largest proved gas reserves in the world after Russia, with 33.6 trillion cubic metres, and third largest natural gas production in the world after Indonesia, and Russia. It also ranks fourth in oil reserves with an estimated 153,600,000,000 barrels. It is OPEC's 2nd largest oil exporter and is an energy superpower. In 2005, Iran spent US$4 billion on fuel imports, because of contraband and inefficient domestic use. Oil industry output averaged 4 million barrels per day (640,000 m3/d) in 2005, compared with the peak of six million barrels per day reached in 1974. In the early years of the 2000s (decade), industry infrastructure was increasingly inefficient because of technological lags. Few exploratory wells were drilled in 2005.
Document 2: Iran: Historically, Iran has been referred to as Persia by the West, due mainly to the writings of Greek historians who called Iran Persis (Greek: Περσίς), meaning "land of the Persians." As the most extensive interactions the Ancient Greeks had with any outsider was with the Persians, the term persisted, even long after the Persian rule in Greece. However, Persis (Old Persian: Pārśa; Modern Persian: Pārse) was originally referred to a region settled by Persians in the west shore of Lake Urmia, in the 9th century BC. The settlement was then shifted to the southern end of the Zagros Mountains, and is today defined as Fars Province.
Document 3: Iran: The administration continues to follow the market reform plans of the previous one and indicated that it will diversify Iran's oil-reliant economy. Iran has also developed a biotechnology, nanotechnology, and pharmaceuticals industry. However, nationalized industries such as the bonyads have often been managed badly, making them ineffective and uncompetitive with years. Currently, the government is trying to privatize these industries, and, despite successes, there are still several problems to be overcome, such as the lagging corruption in the public sector and lack of competitiveness. In 2010, Iran was ranked 69, out of 139 nations, in the Global Competitiveness Report.
Document 4: Iran: In 1941, Reza Shah was forced to abdicate in favor of his son, Mohammad Reza Pahlavi, and established the Persian Corridor, a massive supply route that would last until the end of the ongoing war. The presence of so many foreign troops in the nation also culminated in the Soviet-backed establishment of two puppet regimes in the nation; the Azerbaijan People's Government, and the Republic of Mahabad. As the Soviet Union refused to relinquish the occupied Iranian territory, the Iran crisis of 1946 was followed, which particularly resulted in the dissolution of both puppet states, and the withdrawal of the Soviets.
Document 5: Iran: Alongside the capital, the most popular tourist destinations are Isfahan, Mashhad and Shiraz. In the early 2000s, the industry faced serious limitations in infrastructure, communications, industry standards and personnel training. The majority of the 300,000 tourist visas granted in 2003 were obtained by Asian Muslims, who presumably intended to visit important pilgrimage sites in Mashhad and Qom. Several organized tours from Germany, France and other European countries come to Iran annually to visit archaeological sites and monuments. In 2003, Iran ranked 68th in tourism revenues worldwide. According to UNESCO and the deputy head of research for Iran Travel and Tourism Organization (ITTO), Iran is rated 4th among the top 10 destinations in the Middle East. Domestic tourism in Iran is one of the largest in the world. Weak advertising, unstable regional conditions, a poor public image in some parts of the world, and absence of efficient planning schemes in the tourism sector have all hindered the growth of tourism.
Document 6: Iranian languages: Old Persian is the Old Iranian dialect as it was spoken in south-western Iran by the inhabitants of Parsa, who also gave their name to their region and language. Genuine Old Persian is best attested in one of the three languages of the Behistun inscription, composed circa 520 BC, and which is the last inscription (and only inscription of significant length) in which Old Persian is still grammatically correct. Later inscriptions are comparatively brief, and typically simply copies of words and phrases from earlier ones, often with grammatical errors, which suggests that by the 4th century BC the transition from Old Persian to Middle Persian was already far advanced, but efforts were still being made to retain an "old" quality for official proclamations.
Document 7: Egypt: Egypt has a developed energy market based on coal, oil, natural gas, and hydro power. Substantial coal deposits in the northeast Sinai are mined at the rate of about 600,000 tonnes (590,000 long tons; 660,000 short tons) per year. Oil and gas are produced in the western desert regions, the Gulf of Suez, and the Nile Delta. Egypt has huge reserves of gas, estimated at 2,180 cubic kilometres (520 cu mi), and LNG up to 2012 exported to many countries. In 2013, the Egyptian General Petroleum Co (EGPC) said the country will cut exports of natural gas and tell major industries to slow output this summer to avoid an energy crisis and stave off political unrest, Reuters has reported. Egypt is counting on top liquid natural gas (LNG) exporter Qatar to obtain additional gas volumes in summer, while encouraging factories to plan their annual maintenance for those months of peak demand, said EGPC chairman, Tarek El Barkatawy. Egypt produces its own energy, but has been a net oil importer since 2008 and is rapidly becoming a net importer of natural gas.
Document 8: Iran: In 1935, Reza Shah requested the international community to refer to the country by its native name, Iran. As the New York Times explained at the time, "At the suggestion of the Persian Legation in Berlin, the Tehran government, on the Persian New Year, Nowruz, March 21, 1935, substituted Iran for Persia as the official name of the country." Opposition to the name change led to the reversal of the decision, and Professor Ehsan Yarshater, editor of Encyclopædia Iranica, propagated a move to use Persia and Iran interchangeably. Today, both Persia and Iran are used in cultural contexts; although, Iran is the name used officially in political contexts.
Document 9: Iran: Shiraz, with a population of around 1.4 million (2011 census), is the sixth major city of Iran. It is the capital of Fars Province, and was also a former capital of Iran. The area was greatly influenced by the Babylonian civilization, and after the emergence of the ancient Persians, soon came to be known as Persis. Persians were present in the region since the 9th century BC, and became rulers of a large empire under the reign of the Achaemenid Dynasty in the 6th century BC. The ruins of Persepolis and Pasargadae, two of the four capitals of the Achaemenid Empire, are located around the modern-day city of Shiraz.
Document 10: History of Iran: The Persian Empire (Persian: شاهنشاهی ایران ‎, translit. Šâhanšâhiye Irân, lit. 'Imperial Iran') refers to any of a series of imperial dynasties that were centred in Persia / Iran from the 6th - century - BC Achaemenid Empire era to the 20th century AD in the Qajar dynasty era.
Document 11: Iran: Tehran is the country's capital and largest city, as well as its leading cultural and economic center. Iran is a major regional and middle power, exerting considerable influence in international energy security and the world economy through its large reserves of fossil fuels, which include the largest natural gas supply in the world and the fourth-largest proven oil reserves. Iran's rich cultural legacy is reflected in part by its 19 UNESCO World Heritage Sites, the fourth-largest number in Asia and 12th-largest in the world.
Document 12: Iran: In 2004, a large share of natural gas reserves in Iran were untapped. The addition of new hydroelectric stations and the streamlining of conventional coal and oil-fired stations increased installed capacity to 33,000 megawatts. Of that amount, about 75% was based on natural gas, 18% on oil, and 7% on hydroelectric power. In 2004, Iran opened its first wind-powered and geothermal plants, and the first solar thermal plant is to come online in 2009. Iran is the third country in the world to have developed GTL technology.
Document 13: Russia in the European energy sector: The Russian Federation supplies a significant volume of fossil fuels and is the largest exporter of oil and natural gas to the European Union. In 2007, the European Union imported from Russia 185 million tonnes of crude oil, which accounted for 32.6% of total oil import, and 100.7 million tonnes of oil equivalent of natural gas, which accounted 38.7% of total gas import.
Document 14: Name of Iran: In the Western world, Persia (or one of its cognates) was historically the common name for Iran. On the Nowruz of 1935, Reza Shah Pahlavi asked foreign delegates to use the term Iran, the endonym of the country, in formal correspondence. Since then, in the Western World, the use of the word ``Iran ''has become more common. This also changed the usage of the terms for Iranian nationality, and the common adjective for citizens of Iran changed from`` Persian'' to ``Iranian ''. In 1959, the government of Mohammad Reza Shah Pahlavi, Reza Shah Pahlavi's son, announced that both`` Persia'' and ``Iran ''could officially be used interchangeably. However the issue is still debated today.
Document 15: Iran: Iran (/aɪˈræn/ or i/ɪˈrɑːn/; Persian: Irān – ایران‎‎ [ʔiːˈɾɒːn] ( listen)), also known as Persia (/ˈpɜːrʒə/ or /ˈpɜːrʃə/), officially the Islamic Republic of Iran (جمهوری اسلامی ایران – Jomhuri ye Eslāmi ye Irān [d͡ʒomhuːˌɾije eslɒːˌmije ʔiːˈɾɒːn]), is a sovereign state in Western Asia. It is bordered to the northwest by Armenia, the de facto Nagorno-Karabakh Republic, and Azerbaijan; to the north by Kazakhstan and Russia across the Caspian Sea; to the northeast by Turkmenistan; to the east by Afghanistan and Pakistan; to the south by the Persian Gulf and the Gulf of Oman; and to the west by Turkey and Iraq. Comprising a land area of 1,648,195 km2 (636,372 sq mi), it is the second-largest country in the Middle East and the 18th-largest in the world. With 78.4 million inhabitants, Iran is the world's 17th-most-populous country. It is the only country that has both a Caspian Sea and an Indian Ocean coastline. Iran has long been of geostrategic importance because of its central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz.
ground_truth: 153,600,000,000 barrels
sub_queries: what is the name of modern day persia Answer: Iran
How much oil reserves does Iran have? Answer: 153,600,000,000 barrels