Translations:Strategy/Wikimedia movement/2017/Sources/Considering 2030: Demographic Shifts – How might Wikimedia extend its reach by 2030?/42/qqq

It is unclear what does it mean "with an expected reduction of 10% over the next 15 years.". Does it mean that in Africa the rate of uneducated will drop from 26 to 10% or from 26 to 23,4%, or maybe from 26% to 16% ?