CREATE TABLE table_204_42 (id DECIMAL, "season" DECIMAL, "level" TEXT, "division" TEXT, "section" TEXT, "position" TEXT, "movements" TEXT)

how long after 1999 was there a relegated movement ?
SELECT (SELECT "season" FROM table_204_42 WHERE "movements" = 'relegated') - 1999
SELECT (SELECT "season" FROM "table_204_42" WHERE "movements" = 'relegated') - 1999