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 |
| --- | --- | --- | --- | --- | --- |
| 1973.0 | 250cc | Yamaha | 21.0 | 11th | 0.0 |
| 1973.0 | 350cc | Yamaha | 16.0 | 13th | 0.0 |
| 1974.0 | 250cc | Yamaha | 50.0 | 3rd | 0.0 |
| 1974.0 | 350cc | Yamaha | 47.0 | 3rd | 0.0 |
| 1974.0 | 500cc | Yamaha | 8.0 | 21st | 0.0 |
| 1975.0 | 250cc | Yamaha | 48.0 | 5th | 0.0 |
| 1975.0 | 350cc | Yamaha | 32.0 | 5th | 0.0 |
| 1975.0 | 500cc | Yamaha | 6.0 | 20th | 0.0 |
| 1976.0 | 250cc | Yamaha | 6.0 | 22nd | 0.0 |
| 1976.0 | 350cc | Yamaha | 18.0 | 14th | 0.0 |
| 1977.0 | 250cc | Yamaha | 2.0 | 33rd | 0.0 |
| 1977.0 | 350cc | Yamaha | 15.0 | 17th | 0.0 |
| 1978.0 | 350cc | Yamaha | 9.0 | 17th | 0.0 |
| 1979.0 | 350cc | Yamaha | 12.0 | 15th | 0.0 |
| 1980.0 | 500cc | Yamaha | 10.0 | 16th | 0.0 |
Question:
Which Points is the lowest one that has a Year larger than 1974, and a Rank of 15th?
Answer:
12.0