CREATE TABLE table_71505 ("Member countries" TEXT, "Population" TEXT, "Area  ( km\\u00b2 ) " TEXT, "GDP  ( billion US$ ) " TEXT, "GDP per capita  ( US$ ) " TEXT)

What is the population of the nation that has a GDP per capita (US$) of 11,929?
SELECT "Population" FROM table_71505 WHERE "GDP per capita (US$)" = '11,929'
SELECT "Population" FROM "table_71505" WHERE "GDP per capita (US$)" = '11,929'