CREATE TABLE table_35771 ("Year" FLOAT, "Champion" TEXT, "Venue" TEXT, "Location" TEXT, "Score" TEXT)

When did Kim Thompson win with 278 score?
SELECT SUM("Year") FROM table_35771 WHERE "Score" = '278' AND "Champion" = 'kim thompson'
SELECT SUM("Year") FROM "table_35771" WHERE "Champion" = 'kim thompson' AND "Score" = '278'