CREATE TABLE table_71981 ("Location" TEXT, "Year" FLOAT, "Champion" TEXT, "Runner-up" TEXT, "Score" TEXT)

What was the score when stefan edberg won after 1978?
SELECT "Score" FROM table_71981 WHERE "Year" > '1978' AND "Champion" = 'stefan edberg'
SELECT "Score" FROM "table_71981" WHERE "Champion" = 'stefan edberg' AND "Year" > '1978'