CREATE TABLE table_68396 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" FLOAT)

What year shows the Entrant of bmw motorsport?
SELECT SUM("Year") FROM table_68396 WHERE "Entrant" = 'bmw motorsport'
SELECT SUM("Year") FROM "table_68396" WHERE "Entrant" = 'bmw motorsport'