Worldwide approximately 73 million children are enrolled in each year of secondary education out of a possible 122 million children. That is only 60% getting a secondary education.
In China on average 89% get a secondary education, but in India it is only 49%. Figures in Africa are even lower: 45% in Northern Africa, 25% in Southeastern Africa and 13% in Central Africa. The lowest is 5% in Niger. What is compulsory in some territories is a rarity in others.
The biggest population of secondary students is in China, where a quarter of all the secondary students in the world live.