How did the Gross National Product (GNP) of the US change between 1940 and 1944?

Even with the contractionary fiscal policy from 1937-1938 and recession, average GDP and GNP growth rates from 1934-1940 when moderately expansionary fiscal policy was used were high: Average real GDP growth rate, [ 1934-1940: 7.33%. Average real GNP growth rate, 1934-1940: 7.30%. ]