Question: What is the Lok Sabha for Dravida Munnetra Kazhagam, in 1999-04?
SQL: SELECT "Lok Sabha" FROM "2-18640543-1" WHERE "Party Affiliation" = 'Dravida Munnetra Kazhagam' AND "Duration" = '1999-04';

Question: What is the duration when Lok Sabha shows Fifth?
SQL: SELECT "Duration" FROM "2-18640543-1" WHERE "Lok Sabha" = 'Fifth';