CREATE TABLE table_33457 ("Year" FLOAT, "Drivers" TEXT, "Wins" FLOAT, "Points" TEXT, "D.C." TEXT)

Before 2007, how many wins were there when the point total was 48?
SELECT SUM("Wins") FROM table_33457 WHERE "Points" = '48' AND "Year" < '2007'
SELECT SUM("Wins") FROM "table_33457" WHERE "Points" = '48' AND "Year" < '2007'