CREATE TABLE "doubles_13_6_7" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "partner" text,
  "opponents_in_the_final" text,
  "score_in_the_final" text
);

Question: What is the latest year?
SQL: SELECT MAX("year") FROM "doubles_13_6_7";