If Hitler didn't exist, what population do you think the world would be?

The current world population as per wikipedia is 6,890,300,000. People die every day so this number is always constantly changing. Anyway if Hitler did not exist, or even if the NAZI party did not get into power, it does not mean that the population of the world would have sky-rocketed, because there could have been easily another situation or catalyst such as genocide, disease, warfare, alien invasion whatever which could have killed as many people. What I'm trying to say is that it is hard to estimate what the current world population would be if Hitler did not exist, as there is many factors to take into account.