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:
| Model | Build year | Top speed (In operation) （km/h） | Power output （kW） | Total production |
| --- | --- | --- | --- | --- |
| 6Y2 | 1958—1961 | 101.0 | 4740 | 25.0 |
| 6G1 | 1971 | 120.0 | 5100 | 2.0 |
| 6G | 1973 | 112.0 | 5400 | 40.0 |
| 6K | 1986–1987 | 100.0 | 5100 | 85.0 |
| 8G | 1987–1990 | 100.0 | 2×3200 | 100.0 |
| 8K | 1987 | 100.0 | 2×3200 | 150.0 |
Question:
Tell me the build year for total production of 150
Answer:
1987.0