What is the average number of years for the Houston Rockets 2004-05?
CREATE TABLE table_55471 (
    "Player" text,
    "No.(s)" real,
    "Height in Ft." text,
    "Position" text,
    "Years for Rockets" text,
    "School/Club Team/Country" text
)
SELECT AVG("No.(s)") FROM table_55471 WHERE "Years for Rockets" = '2004-05'
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 average number of years for the Houston Rockets 2004-05? ### Input: CREATE TABLE table_55471 (
    "Player" text,
    "No.(s)" real,
    "Height in Ft." text,
    "Position" text,
    "Years for Rockets" text,
    "School/Club Team/Country" text
) ### Response: SELECT AVG("No.(s)") FROM table_55471 WHERE "Years for Rockets" = '2004-05'