CREATE TABLE table_22815568_7 (unemployment_rate VARCHAR2, market_income_per_capita VARCHAR2)

What is the unemployment rate in those places where the market income per capita is $16,981?
SELECT COUNT(unemployment_rate) FROM table_22815568_7 WHERE market_income_per_capita = "$16,981"
SELECT COUNT("unemployment_rate") FROM "table_22815568_7" WHERE "$16,981" = "market_income_per_capita"