CREATE TABLE table_42871 ("Year" FLOAT, "Competition" CLOB, "Venue" CLOB, "Position" CLOB, "Event" CLOB, "Notes" CLOB)

Which Year has a Competition of olympic games, and a Venue of atlanta, united states?
SELECT AVG("Year") FROM table_42871 WHERE "Competition" = 'olympic games' AND "Venue" = 'atlanta, united states'
SELECT AVG("Year") FROM "table_42871" WHERE "Competition" = 'olympic games' AND "Venue" = 'atlanta, united states'