What is the area (km2) where the population in millions for 2011 is 37.1? 
CREATE TABLE "members" (
  "country" text,
  "area_km" text,
  "population_millions_2011" text,
  "gdp_ppp_usd_per_capita" real,
  "gdp_nominal_billions_usd" text,
  "hdi_2011" text
);
SELECT "area_km" FROM "members" WHERE "population_millions_2011"='37.1';