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

### Instruction:
On what Year did Entrant Leyton House have a Chassis type of Leyton House CG911?

### Inputs:
table_name: table, columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']

### Response:
SELECT Year FROM table WHERE Entrant = leyton house AND Chassis = leyton house cg911