CREATE TABLE table_55229 ("Event" CLOB, "Record" CLOB, "Athlete" CLOB, "Nationality" CLOB, "Date" CLOB)

What was the date of the discus throw for Bulgaria?
SELECT "Date" FROM table_55229 WHERE "Nationality" = 'bulgaria' AND "Event" = 'discus throw'
SELECT "Date" FROM "table_55229" WHERE "Event" = 'discus throw' AND "Nationality" = 'bulgaria'