What is the highest number of Brisbane viewers?
CREATE TABLE table_73648 (
    "WEEK" real,
    "Sydney" real,
    "Melbourne" real,
    "Brisbane" real,
    "Adelaide" real,
    "Perth" real,
    "TOTAL" real,
    "WEEKLY RANK" real
)
SELECT MAX("Brisbane") FROM table_73648
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: What is the highest number of Brisbane viewers? ### Input: CREATE TABLE table_73648 (
    "WEEK" real,
    "Sydney" real,
    "Melbourne" real,
    "Brisbane" real,
    "Adelaide" real,
    "Perth" real,
    "TOTAL" real,
    "WEEKLY RANK" real
) ### Response: SELECT MAX("Brisbane") FROM table_73648