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

### Instruction:
What was the average capacity for vélez sársfield?

### Inputs:
table_name: table, columns: ['Stadium', 'Capacity', 'City', 'Province', 'Home team(s)']

### Response:
SELECT AVG Capacity FROM table WHERE Home team(s) = vélez sársfield