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

### Instruction:
What was the sum of the years, when the entrant was Scuderia Centro Sud, and when there were 6 points?

### Inputs:
table_name: table, columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']

### Response:
SELECT SUM Year FROM table WHERE Entrant = scuderia centro sud AND Points = 6