CREATE TABLE table_53559 ("Year" FLOAT, "Venue" TEXT, "Location" TEXT, "Winning team" TEXT, "Score" TEXT, "U.S. Captain" TEXT, "International Captain" TEXT)

what is the highest year that the U.S. captain is ken venturi?
SELECT MAX("Year") FROM table_53559 WHERE "U.S. Captain" = 'ken venturi'
SELECT MAX("Year") FROM "table_53559" WHERE "U.S. Captain" = 'ken venturi'