CREATE TABLE table_61815 ("Opposing Teams" TEXT, "Against" FLOAT, "Date" TEXT, "Venue" TEXT, "Status" TEXT)

What is the smallest Against with a Date of 18/02/1989?
SELECT MIN("Against") FROM table_61815 WHERE "Date" = '18/02/1989'
SELECT MIN("Against") FROM "table_61815" WHERE "Date" = '18/02/1989'