The bar chart illustrates the changes of gorilla populations in the wild across seven African countries in the years of 1990 and 2015.
Overall, it is noticeable that Uganda recorded the largest number of gorillas among all countries throughout the period, whereas Gabon had the smallest populations. While three nations (Uganda, the Central African Republic, Rwanda) exhibited a decline in gorilla population, the other four countries (Nigeria, Angola, Cameroon, Gabon) either remained relatively the same or showed a marginal rise.
In 1990, Uganda saw the highest level of gorilla population, at 9,000 individuals. However, this figure experienced a significant decline to 7,000 in 2015. The Central African Republic followed a similar pattern, with the population falling from 6,000 to 5,500 over a 25-year period. Meanwhile, Rwanda had the most significant gap, with the 1990 population being more than double the 2015 figure (2,500 and 1,000, respectively).
In contrast, Nigeria maintained a stable population across the years, at 2,500. Similarly, Cameroon and Angola increased slightly, rising from 1,250 to approximately 1,300 each. The number of gorillas in Gabon also showed a slight rise, accounting for only 1,000 in 1990 and 1,050 in 2015.