Question: What is the population of the country formerly called Persia?

full_context: Document 1: Iranshenasi: Iran Shenasi also spelled as "Iranshinasi" () is an academic journal of Iranian studies. The founding editor-in-chief is Jalal Matini. The journal is published in Persian (with English abstracts) and covers Iranian history, Persian culture, and Persian literature. The majority of research libraries in the world that have a Middle Eastern or Iranian studies program are subscribers and it is considered as one of the most authoritative journals on the culture of Iran and Persian literature.
Document 2: Iran: Iran consists of the Iranian Plateau with the exception of the coasts of the Caspian Sea and Khuzestan Province. It is one of the world's most mountainous countries, its landscape dominated by rugged mountain ranges that separate various basins or plateaux from one another. The populous western part is the most mountainous, with ranges such as the Caucasus, Zagros and Alborz Mountains; the last contains Iran's highest point, Mount Damavand at 5,610 m (18,406 ft), which is also the highest mountain on the Eurasian landmass west of the Hindu Kush.
Document 3: 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 4: 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 5: Enayatollah Reza: Enayatollah Reza (; June 18, 1920 in Rasht – July 20, 2010 in Tehran) was an Iranian historian and professor of philosophy, a former member of the Iranian Communist Party, and a former Iranian military officer. He was a member of the Supreme Academic Council of the Centre for Iranian and Islamic Studies in Tehran, Iran, the publishers of the "Encyclopaedia Islamica". His research concerned the historical regions of Iranian Azerbaijan and Caucasian Arran; based on this research, he claimed that "Azerbaijan" should properly refer only to the land south of the Aras River (in Iran) and that the country of Azerbaijan should instead be called "Aran".
Document 6: 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.
Document 7: 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 8: Iran: Iran has an area of 1,648,195 km2 (636,372 sq mi). Iran lies between latitudes 24° and 40° N, and longitudes 44° and 64° E. Its borders are with Azerbaijan (611 km or 380 mi, with Azerbaijan-Naxcivan exclave, 179 km or 111 mi) and Armenia (35 km or 22 mi) to the north-west; the Caspian Sea to the north; Turkmenistan (992 km or 616 mi) to the north-east; Pakistan (909 km or 565 mi) and Afghanistan (936 km or 582 mi) to the east; Turkey (499 km or 310 mi) and Iraq (1,458 km or 906 mi) to the west; and finally the waters of the Persian Gulf and the Gulf of Oman to the south.
Document 9: Iran: Between 1872 and 1905, a series of protests took place in response to the sale of concessions to foreigners by Nasser od Din and Mozaffar od Din shahs of Qajar, and led to the Iranian Constitutional Revolution. The first Iranian Constitution and the first national parliament of Iran were founded in 1906, through the ongoing revolution. The Constitution included the official recognition of Iran's three religious minorities, namely Christians, Zoroastrians, and Jews, which has remained a basis in the legislation of Iran since then.
Document 10: 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 11: 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 12: 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 13: Geography of Iran: The topography of Iran consists of rugged, mountainous rims surrounding high interior basins. The main mountain chain is the Zagros Mountains, a series of parallel ridges interspersed with plains that bisect the country from northwest to southeast. Many peaks in the Zagros exceed 3,000 metres (9,843 ft) above sea level, and in the south - central region of the country there are at least five peaks that are over 4,000 metres (13,123 ft).
Document 14: Iran: At its greatest extent, the Achaemenid Empire included the modern territories of Iran, Azerbaijan, Armenia, Georgia, Turkey, much of the Black Sea coastal regions, northeastern Greece and southern Bulgaria (Thrace), northern Greece and Macedonia (Paeonia and Ancient Macedon), Iraq, Syria, Lebanon, Jordan, Israel, Palestine, all significant ancient population centers of ancient Egypt as far west as Libya, Kuwait, northern Saudi Arabia, parts of the UAE and Oman, Pakistan, Afghanistan, and much of Central Asia, making it the first world government and the largest empire the world had yet seen.
Document 15: Islamic Republic of Iran Navy: It is charged with the responsibility of forming Iran's first line of defense in the Gulf of Oman and beyond with the mission of acting as an effective blue-water navy. However, it is generally considered as a conventional green-water navy as it mostly operates at a regional level, in the Persian Gulf and Gulf of Oman but also as far afield as the Red Sea, the Mediterranean Sea and northwest quarter of the Indian Ocean. In July 2016, the Navy said that it would establish a presence in the Atlantic Ocean, of unspecified duration.
ground_truth: 78.4 million
sub_queries: Which name is officially used politically? Answer: Iran
How many people live in Iran ? Answer: 78.4 million