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

### Instruction:
What is the completion percentage when yards per attempt was done by Steve McNair : 2003?

### Inputs:
table_name: table, columns: ['Rank', 'Rating', 'Completion Percentage', 'Touchdown Percentage', 'Yards Per Attempt', 'Total Yards']

### Response:
SELECT Completion Percentage FROM table WHERE Yards Per Attempt = Steve McNair : 2003