of the most corrupt nations in the world. According to the Global Hunger Index of 2013, Sudan has an GHI indicator value of 27.0 indicating that the nation has an 'Alarming Hunger Situation.' It is rated the fifth hungriest nation in the world. According to the 2015 Human Development Index (HDI) Sudan ranked the 167th place in human development, indicating Sudan still has one of the lowest human development rates in the world. In 2014, 45% of the population lives on less than US$3.20 per day, up from 43% in 2009. Science and research Sudan has around 25–30 universities; instruction is primarily in Arabic or English. Education at the secondary and university levels has been seriously hampered by the requirement that most males perform military service before completing their education. In addition, the "Islamisation" encouraged by president Al-Bashir alienated many researchers: the official language of instruction in universities was changed from English to Arabic and Islamic courses became mandatory. Internal science funding withered. According to UNESCO, more than 3,000 Sudanese researchers left the country between 2002 and 2014. By 2013, the country had a mere 19 researchers for every 100,000 citizens, or 1/30 the ratio of Egypt, according to the Sudanese National Centre for Research. In 2015, Sudan published only about 500 scientific papers. In comparison, Poland, a country of similar population size, publishes on the order of 10,000 papers per year. Demographics In Sudan's 2008 census, the population of northern, western and eastern Sudan was recorded to be over 30 million. This puts present estimates of the population of Sudan after the secession of South Sudan at a little over 30 million people. This is a significant increase over the past two decades, as the 1983 census put the total population of Sudan, including present-day South Sudan, at 21.6 million. The population of Greater Khartoum (including Khartoum, Omdurman, and Khartoum North) is growing rapidly and was recorded to be 5.2 million. Aside from being a refugee-generating country, Sudan also hosts a large population of refugees from other countries. According to UNHCR statistics, more than 1.1 million refugees and asylum seekers lived in Sudan in August 2019. The majority of this population came from South Sudan (858,607 people), Eritrea (123,413), Syria (93,502), Ethiopia (14,201), the Central African Republic (11,713) and Chad (3,100). Apart from these, the UNHCR report 1,864,195 Internally Displaced Persons (IDP's). Sudan is a party to the 1951