CREATE TABLE table_204_805 (id DECIMAL, "name" TEXT, "club" TEXT, "date of departure" TEXT, "replacement" TEXT, "date of appointment" TEXT)

how many managerial changes were there in 2009 ?
SELECT COUNT(*) FROM table_204_805 WHERE "date of departure" = 2009
SELECT COUNT(*) FROM "table_204_805" WHERE "date of departure" = 2009