The graph illustrates the population changes between 2011 and 2016 of three species, namely bears, whales, and dolphins, in their natural environment.
Overall, there was a noticeable upward trend in the number of bears, while dolphins followed an opposite scenario. The population of whales witnessed a fluctuation throughout the period.
Looking at the graph in more detail, in 2011, the number of bears was the lowest in comparison to the other species, with about 5,000. However, their population increased gradually from 2011 to 2014 and saw the greatest population among the three species in 2014 with around 120,000. In the last two years of the period, bears experienced a significant growth and stood at just under 150,000 species.
In contrast, the population of dolphins witnessed a considerable decrease over the period. Despite showing the highest number at the beginning with 150,000, their population dropped substantially to roughly 10,000 in 2014. From 2014 to 2016, the number of dolphins fell minimally and reached nearly zero in 2016. Additionally, whales fluctuated throughout the period, between 50,000 and 100,000. By 2016, there were approximately 70,000 species, similar to their figure in 2011.