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:
| Name | Year commissioned | Gross head (metres) | Installed capacity (megawatts) | Average annual output (million KWh) |
| --- | --- | --- | --- | --- |
| Deanie | 1963.0 | 113.0 | 38.0 | 92.0 |
| Culligran | 1962.0 | 60.0 | 19.0 | 59.0 |
| Mullardoch | 1955.0 | 27.0 | 2.4 | 8.0 |
| Fasnakyle | 1951.0 | 159.0 | 69.0 | 254.0 |
| Aigas | 1962.0 | 18.0 | 20.0 | 60.0 |
| Kilmorack | 1962.0 | 17.0 | 20.0 | 58.0 |
Question:
What is the earliest Year commissioned wiht an Average annual output greater than 58 and Installed capacity of 20?
Answer:
1962.0