How many vacators have October 22, 1808 as date successor seated?
CREATE TABLE table_73399 (
    "District" text,
    "Vacator" text,
    "Reason for change" text,
    "Successor" text,
    "Date successor seated" text
)
SELECT COUNT("Vacator") FROM table_73399 WHERE "Date successor seated" = 'October 22, 1808'
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 vacators have October 22, 1808 as date successor seated? ### Input: CREATE TABLE table_73399 (
    "District" text,
    "Vacator" text,
    "Reason for change" text,
    "Successor" text,
    "Date successor seated" text
) ### Response: SELECT COUNT("Vacator") FROM table_73399 WHERE "Date successor seated" = 'October 22, 1808'