CREATE TABLE table_22815568_6 (market_income_per_capita VARCHAR2, poverty_rate VARCHAR2)

If the poverty rate is 12.9%, what is the market income per capita?
SELECT market_income_per_capita FROM table_22815568_6 WHERE poverty_rate = "12.9%"
SELECT "market_income_per_capita" FROM "table_22815568_6" WHERE "12.9%" = "poverty_rate"