Study the given table and answer the question that follows.
The given table provides information about percentage marks obtained by students of classes X, XI and XII during 2020-2022.
| Year | Percentage Marks | ||
| X | XI | XII | |
| 2020 | 90 | 80 | 94 |
| 2021 | 80 | 85 | 96 |
| 2022 | 70 | 90 | 98 |
What is the difference between the average percentage marks of class X and XII during 2020-2022?