Muslim world but are rapidly increasing. In the Eastern Middle East, Iran has a high level of youth literacy at 98%, whereas Iraq's youth literacy rate has sharply declined from 85% to 57%, during the American-led war and subsequent occupation. Indonesia, the largest Muslim-majority country in the world, has a very high youth literacy rate at 99%. In Afghanistan, seminaries are operated by politically active religious organizations and have taken the place of basic education not provided and funded by the government. A 2016 Pew Research Center study about religion and education around the world found that Muslims have the lowest average
World population less than US$1.25 per day; approximately 870 million people (12.25%) are undernourished. 83% of the world's over-15s are considered literate. In June 2014, there were around 3.03 billion global Internet users, constituting 42.3% of the world population. The Han Chinese are the world's largest single ethnic group, constituting over 19% of the global population in 2011. The world's most-spoken first languages are Mandarin Chinese (spoken by 12.44% of the world's population), Spanish (4.85%), English (4.83%), Arabic (3.25%) and Hindustani (2.68%). The world's largest religion is Christianity, whose adherents account for 31% of the global population; Islam is the second-largest religion,