CREATE TABLE table_2199 ("Index  ( Year ) " TEXT, "Author / Editor / Source" TEXT, "Year of publication" TEXT, "Countries sampled" FLOAT, "World Ranking  ( 1 ) " TEXT, "Ranking L.A.  ( 2 ) " TEXT)

How many countries were sampled in the index created by The Economist, published in 2007 and ranked 2nd in the LA Ranking?
SELECT MAX("Countries sampled") FROM table_2199 WHERE "Author / Editor / Source" = 'The Economist' AND "Year of publication" = '2007' AND "Ranking L.A. (2)" = '2nd'
SELECT MAX("Countries sampled") FROM "table_2199" WHERE "Author / Editor / Source" = 'The Economist' AND "Ranking L.A. (2)" = '2nd' AND "Year of publication" = '2007'