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

### Instruction:
What is the year when kurtis kraft 500f was the chassis?

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

### Response:
SELECT SUM Year FROM table WHERE Chassis = kurtis kraft 500f