CREATE TABLE table_19311 ("Team" TEXT, "Average" TEXT, "Points" FLOAT, "Played" FLOAT, "1989-90" TEXT, "1990-91" TEXT, "1991-1992" FLOAT)

Name the 1991-1992 for river plate
SELECT "1991-1992" FROM table_19311 WHERE "Team" = 'River Plate'
SELECT "1991-1992" FROM "table_19311" WHERE "Team" = 'River Plate'