CREATE TABLE table_name_54 (world_ranking__1_ VARCHAR(255), ranking_la__2_ VARCHAR(255), year_of_publication VARCHAR(255))
In 2008, what was the world ranking that ranked 5th in L.A.?
    
SQL: SELECT world_ranking__1_ FROM table_name_54 WHERE ranking_la__2_ = "5th" AND year_of_publication = "2008"