Question: How many countries spent at least $51.0 billion in international tourism in 2012?
Schema: create table table_29789_3 (rank_2012 integer, international_tourism_expenditure_2011 varchar, PRIMARY KEY (rank_2012))
SQL: select max(rank_2012) from table_29789_3 where international_tourism_expenditure_2011 = "$51.0 billion"