China was always said to have a high number of population. And India, is a lot smaller, therefore, population would also be a lot smaller- right? Not necessarily. India is actually catching up population wise, take a look at this:
Finding the "B" value
(a.k.a y intercept)
Considering estimation, I believe my calculations are off. Mainly because "b" is almost always negative when according to the graph, it should be positive.
Difference
It is clear that in the beginning - 1950, the difference isn't immense. Later the difference is bigger until it reaches the past decade. From then on, the difference keeps getting smaller.
Here is a graph just to show you the population difference:
Predictions
To summarize,
It is easily predictable to estimate that if India kept it's uprising population slope, India could outnumber China.
Well you never know what can happen in the future. It could be that something unknown to us wipes out one of the countries. It could also be that people decide to leave there country due to war or to some other cause. But if population growth stays accurate to the slope, then I declare India, winner of large population rate.
There aren't any outliers because the growth is pretty continuous.