CREATE TABLE table_20558 ("#" FLOAT, "Date" TEXT, "at/vs." TEXT, "Opponent" TEXT, "Score" TEXT, "Attendance" FLOAT, "Record" TEXT)

How many were in attendance during the game on January 9, 1988?
SELECT "Attendance" FROM table_20558 WHERE "Date" = 'January 9, 1988'
SELECT "Attendance" FROM "table_20558" WHERE "Date" = 'January 9, 1988'