The country in central asia with the highest rate of natural increase is

The answer is "Afghanistan".

The rate of natural increase for Afghanistan in the year 2015 was 28.69 people for every thousand populaces. Rate of natural increase of Afghanistan expanded from 22.93 people for each thousand populaces in 1970 to 28.69 people for every thousand populaces in 2015 developing at a normal yearly rate of 2.85 %.