1984-1986 LOUISIANA PASSENGER PLATE FROM TROOP E. This one was renewed at least once, for 1986-88. The World's Fair plates were issued at a time of austerity in Louisiana. Some were given four year expirations to save costs. Number series in the 232,000-250,000 group are known. Most were issued to new registrants, although at an extra cost a motorist could request to turn in an old plate if lost or illegible.