CREATE TABLE table_69681 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" FLOAT)

What is the earliest year that had a Lotus 49B chassis?
SELECT MIN("Year") FROM table_69681 WHERE "Chassis" = 'lotus 49b'
SELECT MIN("Year") FROM "table_69681" WHERE "Chassis" = 'lotus 49b'