Table: panama_intl_rankings_2
Columns: index_year
author_editor_source
year_of_publication
countries_sampled
world_ranking_1
ranking_l_a_2

Question: In 2008, what was the world ranking that ranked 5th in L.A.?
SQL: SELECT "world_ranking_1" FROM panama_intl_rankings_2 WHERE "ranking_l_a_2" = '5th' AND "year_of_publication" = '2008'