CREATE TABLE table_name_6 (international_tourist_arrivals__2011_ VARCHAR(255), international_tourist_arrivals__2012_ VARCHAR(255))
In 2011, how many tourists visited the country that had 23.4 million tourists in 2012?
    
SQL: SELECT international_tourist_arrivals__2011_ FROM table_name_6 WHERE international_tourist_arrivals__2012_ = "23.4 million"