Em 2011, quantos turistas visitaram o país que teve 23,4 milhões de turistas em 2012?
CREATE TABLE table_name_6 (international_tourist_arrivals__2011_ VARCHAR, international_tourist_arrivals__2012_ VARCHAR)
SELECT international_tourist_arrivals__2011_ FROM table_name_6 WHERE international_tourist_arrivals__2012_ = "23.4 million"