What is the sum of All-Time, when Amateur Era is less than 0?
CREATE TABLE "champions_by_country" (
  "country" text,
  "amateur_era" real,
  "open_era" real,
  "all_time" real,
  "first_title" real,
  "last_title" real
);
SELECT SUM("all_time") FROM "champions_by_country" WHERE "amateur_era"<0;