CREATE TABLE table_67508 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

How many years has Sasol Jordan Yamaha as an Entrant?
SELECT AVG("Year") FROM table_67508 WHERE "Entrant" = 'sasol jordan yamaha'
SELECT AVG("Year") FROM "table_67508" WHERE "Entrant" = 'sasol jordan yamaha'