CREATE TABLE table_204_121 (id NUMBER, "year" CLOB, "game" CLOB, "developer" CLOB, "setting" CLOB, "platform" CLOB, "notes" CLOB)

what year was the last year in which the zx plaform was used in a business simulation video game ?
SELECT MAX("year") FROM table_204_121 WHERE "platform" = 'zx'
SELECT MAX("year") FROM "table_204_121" WHERE "platform" = 'zx'