CREATE TABLE table_6239 ("Year" FLOAT, "Manufacturer" TEXT, "Start" TEXT, "Finish" TEXT, "Team" TEXT)

Which Year has a Finish of 22, and a Team of swan?
SELECT AVG("Year") FROM table_6239 WHERE "Finish" = '22' AND "Team" = 'swan'
SELECT AVG("Year") FROM "table_6239" WHERE "Finish" = '22' AND "Team" = 'swan'