If the second leg is Instituto, what is the total number of aggregate?
CREATE TABLE "losers_knockout" (
  "home_1st_leg" text,
  "home_2nd_leg" text,
  "1st_leg" text,
  "2nd_leg" text,
  "aggregate" text
);
SELECT COUNT("aggregate") FROM "losers_knockout" WHERE "home_2nd_leg"='Instituto';