CREATE TABLE table_55471 ("Player" TEXT, "No. ( s ) " FLOAT, "Height in Ft." TEXT, "Position" TEXT, "Years for Rockets" TEXT, "School/Club Team/Country" TEXT)

What is the average number of years for the Houston Rockets 2004-05?
SELECT AVG("No.(s)") FROM table_55471 WHERE "Years for Rockets" = '2004-05'
SELECT AVG("No.(s)") FROM "table_55471" WHERE "Years for Rockets" = '2004-05'