What is the gpa per capita (nominal) for the country with gdp (nominal) is $52.0 billion?
CREATE TABLE "prospective_members" (
  "country" text,
  "population" real,
  "area_km" real,
  "gdp_nominal" text,
  "gdp_per_capita_nominal" text
);
SELECT "gdp_per_capita_nominal" FROM "prospective_members" WHERE "gdp_nominal"='$52.0 billion';