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

### Instruction:
What is the national cup statistics when the Championship is 21 app / 6 goals?

### Inputs:
table_name: table, columns: ['Season', 'Club', 'Country', 'Championship', 'National Cup', 'International Cup']

### Response:
SELECT National Cup FROM table WHERE Championship = 21 app / 6 goals