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

### Instruction:
When did the official rating 4+ reach 4 633 925?

### Inputs:
table_name: table, columns: ['Episode', 'Date', 'Official rating 4+', 'Share 4+', 'Official rating 16-39', 'Share 16-39']

### Response:
SELECT Date FROM table WHERE Official rating 4+ = 4 633 925