Currently the human population is exhibiting what type of growth

The human population is currently exhibiting a pattern of exponential growth.
Exponential growth is exhibited when the rate of change of the value of a mathematical functional is proportional to the function's current value, resting in its value at any time being an exponential function of time. In exponential growth, a population's per capita growth rate stays the same regardless of population size, making the population grow faster and faster as it gets larger. 

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Ithink that its like 15 mph.