CREATE TABLE table_2201 ("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 for the index in 2nd place in the LA ranking and 23rd in the world ranking?
SELECT "Countries sampled" FROM table_2201 WHERE "Ranking L.A. (2)" = '2nd' AND "World Ranking (1)" = '23rd'
SELECT "Countries sampled" FROM "table_2201" WHERE "Ranking L.A. (2)" = '2nd' AND "World Ranking (1)" = '23rd'