Study Figure 10, which shows the infant mortality rate in Cambodia from 2000 to 2020.
| Year | Infant mortality rate (per 1,000 live births) |
|---|---|
| 2000 | 85.6 |
| 2005 | 67.2 |
| 2010 | 45.1 |
| 2015 | 31.3 |
| 2020 | 22.4 |
Calculate the percentage decrease in the infant mortality rate in Cambodia from 2000 to 2020.
You must show all your workings in the space below.
Give your answer to one decimal place.
