CREATE TABLE table_24966 ("No." FLOAT, "Season" TEXT, "Championship" FLOAT, "No. of teams" FLOAT, "Start  ( reg. season ) " TEXT, "Finish  ( incl. championship ) " TEXT, "Top record" TEXT, "National Champion" TEXT)

What is the year range of season 4?
SELECT "Season" FROM table_24966 WHERE "No." = '4'
SELECT "Season" FROM "table_24966" WHERE "No." = '4'