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

### Instruction:
How many faculty members have 20 years of experience?

### Inputs:
table_name: table, columns: ['SNO', 'College code', 'Faculty name', 'Designation', 'Qualification', 'Department', 'Experience']

### Response:
SELECT COUNT Designation FROM table WHERE Experience = 20 years