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

### Instruction:
What's the average year for the name aida-wedo dorsa with a diameter less than 450?

### Inputs:
table_name: table, columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named']

### Response:
SELECT AVG Year named FROM table WHERE Name = aida-wedo dorsa AND Diameter (km) < 450