The diagrams illustrate global headcounts and pace at which global population grew and is expected to develop in the one hundred year period from 1950 to 2050.
Overall, there are two adverse trends. On the one hand, since the beginning of the time in question, the world has seen an exponential surplus in the number of people. On the other hand, the rate at which babies has majorly changed in the opposite direction with the aforementioned.
Firstly, examining the total number of citizens, it has been a sharp rise from the middle of last century up until now. The census of the first year recorded was only one-third of the contemporary, which is a sheer size of around 8 billions people. This has been accumulated through a boom in census since the 80s; before that, there were mostly some slight additions. In this rate, the earth is expected to accommodate nearly 2 billions more, posing dire threats for scant resources.
Moving to the recreation rate around the world, it strikes little resemblance to the world population in the same period. Since the 1950s, women, on average, have given birth to less than 2 children, the desirable number to sustain a nation. The only break from trend was in the 60s to 70s in which there was a dramatic surge in the total of babies born. This closely corresponded with the phenomenal expansion in the 60s. After those golden years, with parents have been less willing to bear children, the rate has nosedived and is predicted to continue to plunge in the near future, prompting countries to suffer from aging societies.