How many years have a longitude measure of 20.0e?
CREATE TABLE table_21103 (
    "Name" text,
    "Latitude" text,
    "Longitude" text,
    "Diameter (km)" text,
    "Year named" real,
    "Name origin" text
)
SELECT COUNT("Year named") FROM table_21103 WHERE "Longitude" = '20.0E'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many years have a longitude measure of 20.0e? ### Input: CREATE TABLE table_21103 (
    "Name" text,
    "Latitude" text,
    "Longitude" text,
    "Diameter (km)" text,
    "Year named" real,
    "Name origin" text
) ### Response: SELECT COUNT("Year named") FROM table_21103 WHERE "Longitude" = '20.0E'