What is the lowest disposable USD 2011?
CREATE TABLE "methodology" (
  "rank" real,
  "country" text,
  "disposable_usd_2011" real,
  "disposable_usd_growth" real,
  "compulsory_deduction" text,
  "gross_usd_2011" real
);
SELECT MIN("disposable_usd_2011") FROM "methodology";