Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Class | Team | Points | Rank | Wins |
| --- | --- | --- | --- | --- | --- |
| 1969.0 | 50cc | Tomos | 31.0 | 6th | 0.0 |
| 1969.0 | 250cc | Benelli | 12.0 | 15th | 0.0 |
| 1970.0 | 50cc | Tomos | 15.0 | 9th | 0.0 |
| 1970.0 | 125cc | Morbidelli | 15.0 | 11th | 1.0 |
| 1971.0 | 50cc | Derbi | 22.0 | 8th | 0.0 |
| 1971.0 | 125cc | Morbidelli | 39.0 | 8th | 1.0 |
| 1972.0 | 125cc | Morbidelli | 52.0 | 5th | 2.0 |
Question:
Tell me the average wins for class of 50cc and rank of 8th
Answer:
0.0