Where did you read that? In general, over the last 10 years, it has been increasing.
I don't care what stats say its decreasing. It is completely wrong to think that is even possible. Yes, birth rates are decreasing, yes, certain countries have negative population. But world population rates over the last 10 years have increased and will continue to increase.
This is a long-term, global problem. Not a country specific, nor short-term stat problem.
Just to clarify, this graph shows that the "growth rate" decreases, not the actual population. This means that the population still grows, but slower when compared to 50 years ago, and it will be increasing for at least the next 100 years. I think @intelliguy misunderstood your comment and interpreted it as "the world population is decreasing".