CREATE TABLE table_60449 ("Year" FLOAT, "Competition" TEXT, "Venue" TEXT, "Position" TEXT, "Event" TEXT, "Notes" FLOAT)

WHAT YEAR WAS THE WORLD CHAMPIONSHIPS IN WITH NOTES OF 39.01?
SELECT SUM("Year") FROM table_60449 WHERE "Competition" = 'world championships' AND "Notes" = '39.01'
SELECT SUM("Year") FROM "table_60449" WHERE "Competition" = 'world championships' AND "Notes" = '39.01'