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

### Instruction:
What is the average Year, when Country is "U.S.", and when Location is "Edmond , OK"?

### Inputs:
table_name: table, columns: ['Perpetrator', 'Date', 'Year', 'Location', 'Country', 'Killed', 'Injured']

### Response:
SELECT AVG Year FROM table WHERE Country = u.s. AND Location = edmond , ok