With reference to Figure 2, calculate the percentage increase in total government expenditure on renewable energy subsidies in Wales from 2015 to 2022. You are advised to show your working.
Figure 2: Government expenditure on renewable energy subsidies in Wales (2015 to 2022)
| Financial year | £ million |
|---|---|
| 2015 | 320 |
| 2016 | 355 |
| 2017 | 410 |
| 2018 | 485 |
| 2019 | 550 |
| 2020 | 640 |
| 2021 | 720 |
| 2022 | 815 |
