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

### Instruction:
How many years have a longitude measure of 20.0e?

### Inputs:
table_name: table, columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named', 'Name origin']

### Response:
SELECT COUNT Year named FROM table WHERE Longitude = 20.0E