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

### Instruction:
How many different years was the name/designation cetme?

### Inputs:
table_name: table, columns: ['Name / designation', 'Year of introduction', 'Country of origin', 'Primary cartridge', 'primary user']

### Response:
SELECT COUNT Year of introduction FROM table WHERE Name / designation = CETME