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

### Instruction:
How many years of introduction does the Neal Submachine Gun have?

### Inputs:
table_name: table, columns: ['Name/ designation', 'Year of intro', 'Country of origin', 'Primary cartridge', 'Major users']

### Response:
SELECT COUNT Year of intro FROM table WHERE Name/ designation = Neal submachine gun