CREATE TABLE table_68158 ("Year" FLOAT, "Competition" TEXT, "Venue" TEXT, "Position" TEXT, "Event" TEXT)

What's the average Year for the Position of 7th (sf)?
SELECT AVG("Year") FROM table_68158 WHERE "Position" = '7th (sf)'
SELECT AVG("Year") FROM "table_68158" WHERE "Position" = '7th (sf)'