The bar chart illustrates the estimated population of wild gorillas in seven countries over a 25-year period, commencing from 1990.
Overall, the figures for Uganda, Rwanda, and the Central African Republic followed a downward trend throughout the period, while the remaining countries experienced a slight increase, although their populations remained relatively low. In both years, Uganda had the highest number of wild gorillas.
Regarding downward trends, Uganda accounted for the highest population of wild gorillas in 1990, at just over 7,500, while the Central African Republic ranked second, standing at approximately 5,000. Both figures experienced a modest decline by 2015: the former declined to 7,500, and the latter fell to roughly 4,500. Similarly, the population of wild gorillas was 2,500 in 1990, followed by a significant decrease to about 1,000 by the end of the period, making it the country with the lowest population.
In stark contrast, the figures for Nigeria were virtually unchanged in both years, recording around 2,500. Likewise, the figures for Gabon, Cameroon, and Angola stood at approximately 1,000, 1,200, and 1,300, respectively, at the outset. Afterward, all of them underwent a slight increase, although these increases were relatively modest.