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

### Instruction:
Which year opened is located in west mifflin, pennsylvania?

### Inputs:
table_name: table, columns: ['Coaster Name', 'Park', 'Location', 'Track', 'Builder', 'Year Opened']

### Response:
SELECT Year Opened FROM table WHERE Location = west mifflin, pennsylvania