Table: tourism_rankings_3
Columns: rank
country
international_tourist_arrivals_2012
international_tourist_arrivals_2011
change_2011_to_2012
change_2010_to_2011

Question: In 2011, how many tourists visited the country that had 23.4 million tourists in 2012?
SQL: SELECT "international_tourist_arrivals_2011" FROM tourism_rankings_3 WHERE "international_tourist_arrivals_2012" = '23.4 million'

Question: How many tourists visited the country that had 2.5 million tourists in 2011?
SQL: SELECT "international_tourist_arrivals_2012" FROM tourism_rankings_3 WHERE "international_tourist_arrivals_2011" = '2.5 million'