user: Question: What is the sum of 1938 values where 1933 values are under 68.3 and 1940 valures are under 4.02?
Columns: ['Table 2: Depression Data', '1929', '1931', '1933', '1937', '1938', '1940']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Real Gross National Product (GNP) 1', 101.4, 84.3, 68.3, 103.9, 103.7, 113.0]
SQL:

assistant: SELECT SUM("1938") FROM "Table" WHERE "1933" < 68.3 AND "1940" < 4.02;