what is the difference between the total number of bronze medals won by the united states and west germany ?
CREATE TABLE table_204_311 (
    id number,
    "rank" number,
    "nation" text,
    "gold" number,
    "silver" number,
    "bronze" number,
    "total" number
)
SELECT (SELECT "bronze" FROM table_204_311 WHERE "nation" = 'united states') - (SELECT "bronze" FROM table_204_311 WHERE "nation" = 'west germany')
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the difference between the total number of bronze medals won by the united states and west germany ? ### Input: CREATE TABLE table_204_311 (
    id number,
    "rank" number,
    "nation" text,
    "gold" number,
    "silver" number,
    "bronze" number,
    "total" number
) ### Response: SELECT (SELECT "bronze" FROM table_204_311 WHERE "nation" = 'united states') - (SELECT "bronze" FROM table_204_311 WHERE "nation" = 'west germany')