Study the table below. It shows the number of emigrants (people leaving the UK to live abroad) over a 5-year period.
| Year ending | Number of emigrants |
|---|---|
| June 2017 | 340 000 |
| June 2018 | 325 000 |
| June 2019 | 385 000 |
| June 2020 | 310 000 |
| June 2021 | 290 000 |
What was the mean number of emigrants leaving the UK per year between June 2017 and June 2021?
310 000
325 000
330 000
340 000