CREATE TABLE table_68809 ("Year" FLOAT, "Competition" TEXT, "Venue" TEXT, "Position" TEXT, "Notes" TEXT)

What position had notes of 20km and a year earlier than 2002?
SELECT "Position" FROM table_68809 WHERE "Notes" = '20km' AND "Year" < '2002'
SELECT "Position" FROM "table_68809" WHERE "Notes" = '20km' AND "Year" < '2002'