What year did the United States win with a total of 278?
CREATE TABLE table_12951 (
    "Player" text,
    "Country" text,
    "Year(s) won" text,
    "Total" real,
    "To par" text,
    "Finish" text
)
SELECT "Year(s) won" FROM table_12951 WHERE "Country" = 'united states' AND "Total" = '278'
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 year did the United States win with a total of 278? ### Input: CREATE TABLE table_12951 (
    "Player" text,
    "Country" text,
    "Year(s) won" text,
    "Total" real,
    "To par" text,
    "Finish" text
) ### Response: SELECT "Year(s) won" FROM table_12951 WHERE "Country" = 'united states' AND "Total" = '278'