When zachary sanders is the performer how many first aired are there?
CREATE TABLE table_73084 (
    "Episode title" text,
    "Subject" text,
    "Music by" text,
    "Lyrics by" text,
    "Performed by" text,
    "First aired" text
)
SELECT COUNT("First aired") FROM table_73084 WHERE "Performed by" = 'Zachary Sanders'
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: When zachary sanders is the performer how many first aired are there? ### Input: CREATE TABLE table_73084 (
    "Episode title" text,
    "Subject" text,
    "Music by" text,
    "Lyrics by" text,
    "Performed by" text,
    "First aired" text
) ### Response: SELECT COUNT("First aired") FROM table_73084 WHERE "Performed by" = 'Zachary Sanders'