Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When was the start of the construction of the unit that's been in commercial operation since 04.03.1987?

### Inputs:
table_name: table, columns: ['Unit', 'Type', 'Net power', 'Total power', 'Construction start', 'Construction finish', 'Commercial operation', 'Shut down']

### Response:
SELECT Construction start FROM table WHERE Commercial operation = 04.03.1987