According to calculations for the world population over the past years,then the out come show that the world population had to be around 1 million on 10000 bc and
today the world population is around 7 billions,so the world population increased
to around 7 billions in 12000 years.
Accoding to the evolution theory,humans lived before 250000 years,which means
that the world population increased by i millions from the date 250000 bc up to 10000 bc.
Please your comments
Do that make sense ?

Reference : World Population Growth History Chart