In many tropical regions, the population of sea turtles is decreasing.
The table below shows how the population size of a specific sea turtle species has changed over time.
| Year | 1980 | 2000 | 2020 |
|---|---|---|---|
| Population size | 1.2 million | 700,000 | 450,000 |
Calculate the percentage decrease in the population size between 1980 and 2020. Give your answer to 2 significant figures.
Which of the following is the best description for how the population of sea turtles changed between 1980 and 2020?