CREATE TABLE table_5459 ("s Car plate  ( starting 1937 ) " TEXT, "Voivodeship or city" TEXT, "Capital" TEXT, "Area  ( 1930 )  in 1 , 000skm 2" TEXT, "Population  ( 1931 )  in 1 , 000s" TEXT)

Capital of brze nad bugiem has what population (1931) in 1,000s?
SELECT "Population (1931) in 1,000s" FROM table_5459 WHERE "Capital" = 'brześć nad bugiem'
SELECT "Population (1931) in 1,000s" FROM "table_5459" WHERE "Capital" = 'brześć nad bugiem'