CREATE TABLE table_67542 ("Member countries" CLOB, "Population" CLOB, "Area  ( km\\u00b2 ) " CLOB, "GDP  ( billion US$ ) " CLOB, "GDP per capita  ( US$ ) " CLOB)

What is the per-capita GDP for the country with an overall GDP of 156.640?
SELECT "GDP per capita (US$)" FROM table_67542 WHERE "GDP (billion US$)" = '156.640'
SELECT "GDP per capita (US$)" FROM "table_67542" WHERE "GDP (billion US$)" = '156.640'