CREATE TABLE table_name_13 (lok_sabha VARCHAR(255), party_affiliation VARCHAR(255), duration VARCHAR(255))
What is the Lok Sabha for Dravida Munnetra Kazhagam, in 1999-04?
    
SQL: SELECT lok_sabha FROM table_name_13 WHERE party_affiliation = "dravida munnetra kazhagam" AND duration = "1999-04"