CREATE TABLE table_23445 ("Index  ( Year ) " CLOB, "Author / Editor / Source" CLOB, "Year of publication" CLOB, "Countries sampled" FLOAT, "World Ranking  ( 1 ) " CLOB, "Ranking L.A.  ( 2 ) " CLOB)

How many items were under ranking l.a.(2) when the world ranking was 21st?
SELECT COUNT("Ranking L.A. (2)") FROM table_23445 WHERE "World Ranking (1)" = '21st'
SELECT COUNT("Ranking L.A. (2)") FROM "table_23445" WHERE "World Ranking (1)" = '21st'