Question: What is the average 2006 metropolitan population of lima with a GDP per capita over $13100?
SQL: SELECT AVG("Metropolitan population (2006) Millions") FROM "2-18524-5" WHERE "Metropolitan area" = 'lima' AND "GDP (PPP) US$ per capita" > 13100.0;

Question: What is the lowest 2006 metropolitan population for a mexico city, mexico with a GDP per capita of less than 20300?
SQL: SELECT MIN("Metropolitan population (2006) Millions") FROM "2-18524-5" WHERE "Country" = 'mexico' AND "Metropolitan area" = 'mexico city' AND "GDP (PPP) US$ per capita" < 20300.0;