What's the highest level of team Astana since 2007?
CREATE TABLE "club_career_stats" (
  "season" real,
  "team" text,
  "country" text,
  "league" text,
  "level" real,
  "apps" real,
  "goals" real
);
SELECT MAX("level") FROM "club_career_stats" WHERE "team"='astana' AND "season">2007;