CREATE TABLE table_53224 ("Year" FLOAT, "Division" CLOB, "League" CLOB, "Reg. Season" CLOB, "Playoffs" CLOB, "Open Cup" CLOB)

Which year had playoffs of champion?
SELECT AVG("Year") FROM table_53224 WHERE "Playoffs" = 'champion'
SELECT AVG("Year") FROM "table_53224" WHERE "Playoffs" = 'champion'