CREATE TABLE "top_appearances" (
  "rank" real,
  "player" text,
  "club_s" text,
  "year_s" text,
  "u_16_caps" real
);

Question: During what years was álvaro pérez the number 2 ranked player?
SQL: SELECT "year_s" FROM "top_appearances" WHERE "rank"=2 AND "player"='álvaro pérez';