CREATE TABLE table_71305 ("Member countries" TEXT, "Population" TEXT, "Area  ( km\\u00b2 ) " TEXT, "GDP  ( billion US$ ) " TEXT, "GDP per capita  ( US$ ) " TEXT)

What is the GDP (billion US$) of the country that has a GDP per capita (US$) of 8,861?
SELECT "GDP (billion US$)" FROM table_71305 WHERE "GDP per capita (US$)" = '8,861'
SELECT "GDP (billion US$)" FROM "table_71305" WHERE "GDP per capita (US$)" = '8,861'