CREATE TABLE table_name_25 (year NUMBER, result VARCHAR2, venue VARCHAR2)

What year is the result 6th in munich, west germany?
SELECT SUM(year) FROM table_name_25 WHERE result = "6th" AND venue = "munich, west germany"
SELECT SUM("year") FROM "table_name_25" WHERE "6th" = "result" AND "munich, west germany" = "venue"