In the past 100 years how much have the population increased?

The population has increased because of a few reasons. One reason is because the death rates has decreased a lot because of the medicines ,they have gotten a lot better from our newer knowledge. The birth rates are increasing a little because of the unawareness of the people, and the parents consider the children growing up and owning there businesses and making themwealthier, since the death rates have decreased there is more births than deaths, so the population gets higher.