Before 2007, how many wins were there when the point total was 48?
CREATE TABLE "porsche_supercup" (
  "year" real,
  "drivers" text,
  "wins" real,
  "points" text,
  "d_c" text
);
SELECT SUM("wins") FROM "porsche_supercup" WHERE "points"='48' AND "year"<2007;