What is every value for  % 40-59 if  % 60-74 is 12,40%?
CREATE TABLE "external_links" (
  "neighbourhood" text,
  "pct_0_19" text,
  "pct_20_39" text,
  "pct_40_59" text,
  "pct_60_74" text,
  "pct_75" text
);
SELECT "pct_40_59" FROM "external_links" WHERE "pct_60_74"='12,40%';