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

### Instruction:
What is the total number of Year(s), when Date (Opening) is "September 21"?

### Inputs:
table_name: table, columns: ['Year', 'Date (Opening)', 'Date (Closing)', 'Opening Film', 'Number of Screening']

### Response:
SELECT COUNT Year FROM table WHERE Date (Opening) = september 21