CREATE TABLE table_15595 ("1910s" FLOAT, "1920s" FLOAT, "1930s" FLOAT, "1940s" FLOAT, "1950s" FLOAT, "1960s" FLOAT, "1970s" FLOAT, "1980s" FLOAT, "1990s" FLOAT, "2000s" FLOAT)

What is the corresponding 1930s for 2000 and 1940?
SELECT SUM("1930s") FROM table_15595 WHERE "2000s" = '2000' AND "1940s" < '1940'
SELECT SUM("1930s") FROM "table_15595" WHERE "1940s" < '1940' AND "2000s" = '2000'