CREATE TABLE table_73730 ("Country" TEXT, "Annual CO2 emissions  ( in thousands of metric tons ) " FLOAT, "GDP  ( current ,  in billions of US dollars ) " TEXT, "GDP per Emissions  ( in US dollars per ton ) " FLOAT, "GDP  ( PPP ,  in billions of current international dollars ) " TEXT, "PPP GDP per Emissions  ( in international dollars per ton ) " FLOAT)

when the gdp per emissions (in us dollars per ton) is 3903, what is the maximum annual co2 emissions (in thousands of metric tons)?
SELECT MAX("Annual CO2 emissions (in thousands of metric tons)") FROM table_73730 WHERE "GDP per Emissions (in US dollars per ton)" = '3903'
SELECT MAX("Annual CO2 emissions (in thousands of metric tons)") FROM "table_73730" WHERE "GDP per Emissions (in US dollars per ton)" = '3903'