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

### Instruction:
How many years have a Pick of 12, and a Position of dt, and a College of penn state?

### Inputs:
table_name: table, columns: ['Year', 'Pick', 'Player', 'Position', 'College']

### Response:
SELECT COUNT Year FROM table WHERE Pick = 12 AND Position = dt AND College = penn state