CREATE TABLE "merchandise_trade" (
  "country" text,
  "population_in_2011_in_thousands" real,
  "gdp_nominal_in_2011_usd_millions" real,
  "gdp_nominal_per_capita" real,
  "gdp_ppp_in_2011_usd_millions" real,
  "gdp_ppp_per_capita" real,
  "merchandise_exports_billions_2011" text,
  "merchandise_imports_billions_2011" text,
  "exports_to_mercosur_pct_of_each_2010" text,
  "imports_from_mercosur_pct_of_each_2010" text
);

Question: How many different imports from Mercosur had a % of 18.0?
SQL: SELECT COUNT("gdp_nominal_per_capita") FROM "merchandise_trade" WHERE "imports_from_mercosur_pct_of_each_2010"='18.0';

Question: What is the GDP (ppp) in 2011 when the imports from Mercosur is 48.8?
SQL: SELECT MIN("gdp_ppp_in_2011_usd_millions") FROM "merchandise_trade" WHERE "imports_from_mercosur_pct_of_each_2010"='48.8';

Question: What is the lowest GDP (ppp) per capita?
SQL: SELECT MIN("gdp_ppp_per_capita") FROM "merchandise_trade";